[Cameramakers] LF digital
I think ReCon (maker of Bay of Pigs camera) makes stuff like that. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] 20x24 film size
Kind of a circular definition given the Manhattan Project secrecy about film size, but I guess I'd convert 20x24 to metric and see what their chart then tells me. I realize it makes the assumption that you 'know' the size by using the nominal size, but the chart they sent me is only useful if they tell you the 'secret size'. Maybe the mail order film companies that sell such film sizes can tell us. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Fw: Black and White Films (KMM3450335C0KM)
I inquired of Kodak today about sheet film sizes and got an interesting reply. Aside from being 'proprietary' (!), there is a reference for how they come up with the tolerances for various sizes Hello Murray, Thank you for contacting Kodak Professional. The exact sizes of sheet film are proprietary information; however, Kodak does conform to the ANSI standards listed below: |Nominal Size | Minimum | Aim | Maximum | | (Inches)| (Inches)| (Inches)| (Inches)| - | 4 x 5 | 3.91 x 4.91 | 3.92 x 4.92 | 3.94 x 4.94 | - | 8 x 10 | 7.91 x 9.92 | 7.94 x 9.95 | 7.97 x 9.98 | - For sizes not shown in the previous table, use this ANSI standard: +|---|---+ | Nominal Size (N) | Aim | Tolerances | | (Centimeters)| (Millimeters) | (Millimeters) | ++ |N 12 |N - 1.5| + 0.5 | ++ | 12 N 65 |N - 2.0| + 1.0 | ++ | 65 N |N - 2.5| + 1.5 | ++---+---+ http://www.kodak.com/go/professional If you should have any questions on Kodak products or services, please be sure to revisit our site as we are continually adding information to enhance our support. If you need further assistance you may also reach us at 1-800-242-2424 ext. 19 (Monday-Friday, 9am-7pm EST) Regards, Bruce H. KODAK Information and Technical Support KODAK Professional Original message follows: - Question: Hello: I am looking for standard dimensions for 4x5 and 5x7 film to make a fixture to cut down 5 roll film to fit 4x5 and 5x7 film holders. Thank you Category: Professional Subcategory: Black and White Films Referer: readableSubject: Black and White Films Name: Murray Leshner Email: [EMAIL PROTECTED] Country: US Phone: Address 1: 205 Columbia Ave Address 2: City: Holland State: MI Zip/Postal Code: 49423 conf: /global/include/en/service/contact/contact.conf --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] High speed photography
Hello: http://www.nevins.ca/drip/ This guy bought my Engineering and High Speed Photography book - he has an interesting project here...I think. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] b/w contrast vs. enlarger light spectrum
Hello: Someone here gave an interesting suggestion regarding having a grid lamp made up that was blue. I don't remember what that was a solution for, but it sounds like it's worth exploring for my big monochromatic lens. I have conflicting wavelength info I will clarify first. What needs to be resolved is whether the light source used was 436 nm mercury-xenon, or 560 (actually double line at I think 544 and 577 nm +/-). The first is blue/violet; the second I think is greenish. Assuming I get the right info, I am curious what will be the effect on contrast of using a narrow spectrum light source in an enlarger. Also, I read a white paper that came from the Schneider Optics site about lens resolution vs. contrast. This was mostly related in terms of spatial frequency which is a step further toward abstraction and a step further away from understanding what it means. It sounds like high resolution lenses have low contrast and vice versa; one design choice among many. Now, whether this means the same thing as the topic of comparing contrast between coated and uncoated lenses. I saw someone's opinion that single coated was more pleasing than multi-coating when dealing with shadows (???). Can someone explain the visual effect of these concepts? Meanwhile, I'm exploring light sources...also have to look at Huw's LED enlarger using mega-LED's (Luxeon?). It appears that the 436 nm Hg-Xe lamps have a huge amount of UV, too. There are smaller ones up to 200 W that don't require forced air cooling - just ugly power supply requirements. Murray Thanks --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Sam's Off-lable use of scouring powder
Thanks! I like that, particularly because it's an off-label use and you made your own abrasive. Now we need someone with a fuel cell to produce their own water! Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] ground glass grinding
I save all the digests, but that makes it harder to retrieve info too - takes a long time to search - If I use Silicon Carbide to make ground glass, what grade or grades should I use? Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Ground Glass lapping compound
1) I'll look into sharpening the 'unblade'. 2) I found some Loctite Clover lapping compound at work today - it was only 240 grit in an oil base. I searched for it and found a Loctite e-catalog that listed the oil and water-base products. I then went and looked at the water-based product. It's called http://www.loctite.com/datasheets/tds/Clover_Silicon_Carbide_Pat_Gel_Water_M ix.pdf It comes in grits from 36 to 2000 and comes in 4 ounce to 25 pound containers. I emailed to ask where it's stocked because their on-line locator didn't find anyone within a 100 mile radius. We shall see. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] lapping compound
It has silicon carbide, water, triethanolamine and diethanolamine. Here's the 600 grit MSDS Murray HENKEL LOCTITE CORPORATIONDate of Preparation: 04/16/01 MATERIAL SAFETY DATA SHEET Page 01 of 05 1. PRODUCT AND COMPANY IDENTIFICATION Product name: Clover Silicon Carbide Pat-Gel Grit Size 600 Item number: 39553 Product Type: Sharpening compound. Company Address: Loctite Corporation 1001 Trout Brook Crossing Rocky Hill, Connecticut. 06067 Medical Emergency Number: (860) 571-5100 Fax: (860) 571-5465 2. COMPOSITION/INFORMATION ON INGREDIENTS IngredientCAS Number % Exposure Limits Water 7732-18-5 60-100 Not established. Triethanolamine 102-71-6 1-5 TWA: 5 mg/m3 ACGIH Diethanolamine111-42-2 0.5-1TWA: 2 mg/m3 ACGIH SKIN TWA: 0.46 ppm ACGIH SKIN Silicon carbide 409-21-2 10-20TWA: 10 mg/m3 ACGIH TWA: 5 mg/m3 OSHA respirable TWA: 15 mg/m3 OSHA total Carbon black 1333-86-4 0.1-0.5 TWA: 3.5 mg/m3 ACGIH TWA: 3.5 mg/m3 OSHA 3. HAZARDS IDENTIFICATION EMERGENCY OVERVIEW PHYSICAL STATE:Paste. COLOR:Gray Gritty. ODOR: Mild. CAUTION! MAY CAUSE EYE AND SKIN IRRITATION. Potential Health Effects Eye: Mild eye irritant. Skin: Mild skin irritation. Redness. Prolonged and/or repeated skin contact with this product may cause irritation/dermatitis. Ingestion: May irritate mouth, throat, and stomach if swallowed. May cause nausea and vomiting. Inhalation: Mild respiratory tract irritation. Conditions Aggravated by Exposure: Skin disorders. HENKEL LOCTITE CORPORATIONDate of Preparation: 04/16/01 MATERIAL SAFETY DATA SHEET Page 02 of 05 Product Name: Clover Silicon Carbide Pat-Gel Item No.: 39553 Chronic: Detailed information provided in section 11. 4. FIRST AID MEASURES Eye: Immediately flush eyes with plenty of water for at least 15 minutes. Get medical attention. Skin: Wash thoroughly with soap and water. Get medical attention if irritation develops and persists. Ingestion: Keep individual calm. DO NOT induce vomiting. Get medical attention. Inhalation: Remove to fresh air. If symptoms develop and persist, get medical attention. Note to Physician: None. 5. FIRE FIGHTING MEASURES Flash Point: Not applicable. Extinguishing Media: Not applicable. Flammable Limits: Not applicable. Special Fire Fighting Procedures: Fire fighters should wear positive pressure self-contained breathing apparatus (SCBA) and full turnout gear. Hazardous Combustion Products: Oxides of carbon. Unusual Fire or Explosion Hazards: None. 6. ACCIDENTAL RELEASE MEASURES In Case of Spill or Leak: Dilute with water and mop up, or absorb with an inert dry material and place in an appropriate waste disposal container. 7. HANDLING AND STORAGE Handling: Avoid contact with eyes. Avoid contact with skin and clothing. Wash thoroughly after handling. HENKEL LOCTITE CORPORATIONDate of Preparation: 04/16/01 MATERIAL SAFETY DATA SHEET Page 03 of 05 Product Name: Clover Silicon Carbide Pat-Gel Item No.: 39553 Storage: Keep container tightly closed. Keep in a cool and well-ventilated area. For information on product shelf life, contact Loctite Customer Service at 1(800)243-4874 8. EXPOSURE CONTROLS/PERSONAL PROTECTION Engineering Controls: Use local exhaust ventilation if the potential for airborne exposure exists. Eye/Face Protection: Chemical splash goggles or safety glasses with side shields. Skin Protection: Chemical resistant, impermeable gloves are recommended. Respiratory Protection: Not normally needed. Use a NIOSH approved respirator if the potential for airborne exposure exists. See Section 2 COMPOSITION/INFORMATION ON INGREDIENTS for exposure limits 9. PHYSICAL AND CHEMICAL PROPERTIES Color:
[Cameramakers] actual film size
Hello: Probably been asked many times before...sorry for repeat questions, unless it's helpful to others... What are actual sizes of 4x5 and 5x7 sheet film? I am going to have a little jig/fixture made to allow me to measure these off a roll of 5 film, in the dark, of course...just slide into the jig to the stop and cut off at the other end. Thanks Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Hyzer contact
If you search Google or whereever for William G Hyzer, you find some weird stuff. He has been called as a photogrammetric expert to analyze UFO photos and military photos for some court case. Here's a third party contact page from some forensics group. His name was on it. http://biospace.intota.com/multisearch.asp?strSearchType=allstrQuery=forens ics Here's his bio/resume http://biospace.intota.com/viewbio.asp?bioFile=/xml/biofull/615395data.xmlb ioID=615395strQuery=forensics Contact: (source. whowhere.com) (Mr.) William G Hyzer Phone: 608-754-7167 136 S Garfield Ave, Janesville, WI 53545-4162 Janesville matches the other references I have seen for him. He did some sort of article for some LF publication at some point also. It's a wonder I have so many questions with all the answers I came up with here... Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] High speed photog info for ballistics questioner
http://www.spie.org/web/abstracts/2800/2869.html Lots of references on High-speed photography (and photonics) Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Browsing USPTO for photography patents howto:
Options: 1) Search for anything 1975-to-present by keyword in any of the available fields GO TO www.uspto.gov CLICK on Patents on left side of page. Then CLICK SEARCH patents. CLICK QUICK or ADVANCED search. Or just go here: http://patft.uspto.gov/netahtml/search-bool.html 2) Search for stuff earlier than 1976. I find the earliest stuff more interesting for DIY. The later stuff tends to be hi-tech, miniaturized 35 mm that I can't build with my clumsy thumbs. You cannot search by keyword pre-1976 because everything has been archived by scanning and saving as tiff files, typically under 130k each. You need to have a browser capable of viewing tiff for most effective use, but there are other ways to et by probably. On the USPTO website are links to AlternaTiff, a free download browser plugin that integrates display of tiff's into your browser. From there you can print and save to files the patent pages one at a time. Beats paying them for copies! Another trick for old patents. They are saved by patent number. Well, what if you don't know the patent number? You browse thru the Patent Classes to find the subject you want, then start browsing the patents by patent number. Yes, you have to look at each one, but if you went there looking for info on aerial cameras, for example, you're probably happy to find a list of 20 patent numbers identified for you to look at. Now to find the patent classes you're interested in. Lets restrict this discussion to PHOTOGRAPHY only. Class number 396. http://www.uspto.gov/go/classification/ will give you a search by Classification page. Put 396 in the left side of the blank and leave /___ empty. (See below or follow the link). Then choose .pdf or html. I just realized today the html version lets you link right to the stuff directly instead of jotting it down and re-searching. A. Access Classification Info by Class/Subclass 1. Enter a USPC Classification... __/ Or, if you want an easy listing of all 14 pages of Photography subclasses by topic to read first and don't want to navigate teh learning curve, I've stored it at http://www.uptowngallery.org/sched396.pdf http://www.uspto.gov/go/classification/uspc396/sched396.htm for the html list/links Searching by class number under Query looks like this, for example ccl/(396/65) - this lists patents under Current Classification 396 (photography) and subclass 65 (I picked that at random forget what it was). Such a search will give you the patent numbers under that subject, be it exposure control or whatever you chose. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] range of adjustment for for DIY standards?
Hello: Is there a rule of thumb for how much range of adjustment one needs to build in for DIY standards? I guess rise fall are the important ones. During the discussions about 16x20 or 20x24 format it was made clear that aside from rigidity, standards from smaller format cameras wouldn't rise enough to center the front standard with the film! It would be nice to know for smaller standards. I think I can visualize the front standard's 'zero' or middle position has to be at least the height of half the long side of the back standard + however much offset there is for fall of the back standard. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] widefield Process lenses for enlarging
Hello: There's no free lunch... Some process lenses are priced very attractively. Then when you get one in your hand, even if you knew ahead of time, the reality of no shutter, no lens shade, etc makes you realize you have more work to do. Then you hear that the incredible image circle specs (if you have those) are for 1:1; expect half that for infinity and that f/9 makes for a pretty dim image on ground glass so you better learn hyperfocal calculation and bring a measuring tape for dusk of evening shots. So, is it a safe assumption that these lenses would be fine for closeup/macro work? Also, if I use the camera as an enlarger, the distance from film to lens would be the parameter that has the restriction for coverage. If this is correct I would not be limited to 1:1 to 4:1 (or is that 1:4) range the lenses are typically designed for for a process camera...I just need a longer darkroom for larger enlargements...am I on track? Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Chuck or Gene
Only two people had content in the last cameramakers digest, so one or both of you is guilty of having HTML formatting set up on your email software instead of plain text, and are forwarding the full thread/contents of back forth replies. I won't point less than two fingers, so please take a look or ask questions on how to fix both issues...unless you don't receive digest format, you must have seen how much of the last digest was readable and how much was not. :O) Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Patent web address
If you're talking about the USPTO address, it's www.uspto.gov It seems to 'need' the www part. I will figure out how I extracted the Photography 'Class' listings. If there's an easier way than me scanning and OCR'ing and proofing the printed pages or saving as image files, I'd prefer that. Maybe saving scans jpeg isn't so bad. Not sure whether to compress because there are Mac people who use different compression than zip. I'm not sure I have the tools to do other than zip. I'll do it see what happens. Then interested parties can inquire. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Graflex
If he brings it in I'll find out Monday what it is. The reason I'd like to look at a 'real' camera rather than virtual one on the web is I can't visualize well from something like Rudolf Mittelmann's Formicula PDF drawings. There is a 'lip' or bump on my filmholders, most of them, I think, that probably determines how far into the camera they insert. That 'threw' me...I thought the filmholder would go straight in from the back and be held in with springs, like the ground glass. I know another person with an inactive 4x5 camera...I'll have to visit it and study it...all this talk isn't the same as seeing one. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] My light question better defined
What I'm trying to do is clarify the difference between irradiance and luminance. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Early photography patents
I downloaded (it took a little effort to figure out how and I've forgotten exactly what I did) the USPTO (US Patent Trademark) database 'class' listings for photography (396). This allows limited searching of the scanned image file archives (can't do text searches on image files). I should save it to disk in case anyone else is interested. That's what I do during my break lunch at work (geek). Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Best (?) process camera
NuArc made tons of industrial cameras...you might ask local printers and newspapers to avoid shipping heavy stuff. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Flash from one x use cameras
Some labs will give 'em up, some wont. I think they get some credit for them. I offered one place to pay their deposit/credit value and in the end they changed their mind...the manager couldn't think out of the box...just couldn't deal with the idea. I think they had 160 uF photoflash electrolytic caps...or was it 160VDC...I forget...seems like 160 uF 330 VDC is coming to mind. They are the lowest lifeform of electrolytic caps...temperature rating only 60 C and short life if used in 'normal' applications. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Flash capacitor energy
Energy stored in capacitor [Joules] = 1/2 * C*V^2 C in Farads, V in volts. I think the voltage is dumped into a transformer or trigger coil, which might be an autotransformer. Many xenon flashes have a lower arc voltage (tens of volts) and a trigger voltage (4-10 kV depending on size) which goes to a wire under the lamp or wrapped around the glass to I guess ionize the gas to allow the arc to strike. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Polaroid conversion questions
Hello Happy Holidays: I gutted 4 Polaroid folding bellows cameras (mostly roll-type, maybe all four were) to see what I could make use of for conversions to 4x5. (J66, 150, 95B, 100). LOTS of rivets to drill out! The J66 and 100 will end up as pinhole cameras. I intend to add an extender box on the back to allow a 4x5 film holder that (hopefully) will be fully covered. I think if I move it far enough back (haven't done the geometry yet, hopefully it's a practical distance!) select an appropriate pinhole, I think they'll work. The 95B and 150 (latter has knob-driven focus, kind of nice) have identical 130 mm (3 element?) lenses and EV exposure system. Polaroid gave me shutter speeds and apertures corresponding to the EV numbers). Now here's where I need help - I'm mechanically and spacially challenged... First experiment will be to see if 130 mm lens has enough circle of coverage to do 4x5 holder, or how much of it will be covered. By adding an extender box on the back while retaining the 130 mm lens, I think I will have to retract the bellows slightly to make up for the distance - if it works out to 150 mm distance at the current infinity focus position, the 130 mm lens will be out of focus there, right ? (at new film position of 150mm) If this is disappointing, I'll have to figure out a way to put a 150 mm lens in. (or a coke bottle 6 diopter eyeglass lens + small iris). Has anyone else done anything like this? Most people talk about 110A/B conversion to pack film with that big Rodenstock Ysarex lens. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] field of view question
Hello and Happy Holidays: Can someone refresh my memory with a formula for determining angle of view? Thank you Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Spotmeter?
Hello: Sorry for duplicating a message on the pinhole list too, but I have an idea for a homebrew spotmeter, but want to read up on 'real ones' first. If any of you own one, I'd appreciate if you'd take a peek on the case and see if there any US Patent numbers so I can start reading. Thanks Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] wind stability
I was thinking more about bellows wind-loading...shaking and vibrating. I want to take Lake Michigan winter photos but it's so windy (a layer of snow will take care of the blowing sand) I hate to get out of the car. Maybe a box camera would be better a bellows type for aggressive wind. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] standard for mega camera
Hello: I am occasionally reminded of wind and rain issues for such cameras. One photographer with a 20x24 told me he has two helpers to hold on to the camera in the wind. Some people have used tent stakes! Ansel Adams discusses (probably oriented toward 8x10) resonance and vibration, mainly about tripods in Camera and Lens (Basic Series). Search web for Rudolf Mittelman's Formicula view camera. He has PDF docs you can download that are essentially blueprints for 4x5 and 8x10 cameras. They might give you ideas for methods to scale up to your format. I am scheming about how to do large standards and what movements I want and how to keep them independent. I have also considered having a machinist mill it from aluminum bar stock. I also save the images from various view and technical cameras I see on eBay to study. I also am considering my 7 x 11.5 40# process lens - how thick an aluminum plate (1/2 , 3/4?) I should use for a lens board (plank/dock/)...comparing #/square foot! Probably drilled for right angle brackets to hang off threaded rod. I'm thinking it might have to be neither a monorail nor a flatbed, but a cage camera, made of Unistrut/Superstrut/Powerstrut steel bar, and not portable, maybe a 16x20 enlarger or indoor camera. I'll settle for wheels I guess. I priced the cage today :O) I guess any quarter-sawn cherry is going to have to be used only on the dashboard. Maybe burl would be better :O) Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Appreciation for massive format
Hello: Nice responses - I have been curious about others' views toward the subject... My wife and I have two photographers in our gallery (we had a third for a while), and I have been extremely frustrated with the attitudes of people who come in and speak without thinking...I call it I can do that syndrome...I want to tell them Oh, please, do bring in your work! I'd love to see it!, but my sarcasm would not be appropriate. It calls to mind the joke - How many art collectors does it take to change a light bulb?...Two - one to change the light bulb, and one to say 'My four-year-old could do that' . Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Polaroid conversions
Considering the unavailability of Polaroid roll film for old Polaroid cameras, does anyone know if hanging a box with a 4x5 filmholder will achieve coverage of the full negative? As I type this, I realize they all have different lenses. I picked up 4, all with bellows and glass lenses, but they range from a meniscus lens to a 3 element set, so I guess I have to try it myself. I am still interested in hearing others' experience, however. Happy Holidays Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] 1)EV scale is OK, 2) Kodak Safety film notch question
Hello: 1) After more reading and responses from list members - EV scale is pretty nice actually! 2) Someone brought in some old photos to frame today and I sized them up quickly - they looked like proof contact prints from 4 x 5 sheet film. The film says Kodak- Safety 76 I am curious about the age of the negative, whether 76 meant film type or 1976. The notches may clue someone in. Scan is at www.multi-volti.com/KodakSafety76.jpg I scanned the scrap piece of photo paper (someone had already cut the photos up before bringing it in). The image was an old off-road racecar, so it could have been any year. Thanks Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] ELF cameramaker survey
I am curious what those of you out there in Camera-Land interested in Extremely Large format (like the16x20 and 20x24) do with the photos... are some of you studio professionals or in galleries elsewhere and sell them or are you amateurs and populate your own walls? My day job is in a techical field and most of the people (one guy went to photog. school had a Graphic Reflex years ago) there seem absolutely bewildered by my interest in this, or even 4x5 format. I can't explain my interest in it - I hope I can produce something that justifies the effort. I am also curious how much room length those of you with horizontal enlargers need. Thank you Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Ansel's problem...
So, Murray, what did he figure out what the problem was in his case? He also said someone else...I don't remember if it was Weston had the same trouble, and they blamed everythign they could think of, including radiation effects (!) before discovering the bellows on the 8x10 cameras they were using were not much larger than the film holders. He advised having an oversized bellows, example given being a 5 x7 one for 4 x 5, so on that advice I assumed a largish filmholder end of a box would be in order. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Box camera idears
[2] How do you guys get the two boxes to slide smoothly I am looking at 1/4 birch veneered plywood $14 a 48 x 96 sheet - probably will stain well or look good natural with some trim over the edges - double wall front for heavy lens. I was looking at ball bearing drawer slides, but they would probably have to be countersunk, or built up layers along side them. I saw a very ugly camera (hope he's not on this list!) that used an old dresser drawer slide (!). I was thinking about wood floor wax or teflon spray for lube. I also wondered how close a fit was really necessary - other than internal reflection, which I guess can't be discounted, if the front was larger than the back, light entering the back would have to go 'around the corner' 180 degrees to get to the filmholder. But I guess that's what a reflection is... I also thought about a black spandex, latex, whatever it's called (I don't wear the stuff) band encircling the 'joint' between the two boxes, kind of like a bag bellows I guess, just for a light seal. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] converting weird light meter scales?
Hello: I picked up a sack o' Polaroid cameras and an Argus LC-3 mini-meter today. The meter dial has f stop 4.5-22 ASA settings, EVS scale from 3.5 to 16 and shutter setting from 8-4. EVS sounds familiar, but it looks like if one attempts to use the Shutter setting scale, the EVS pointer doesn't end up anywhere near the EVS numbers, and vice versa. Anyone know what these mean or how to translate? (Familiar with this meter?) I think I will scan it and make a new scale and calibrate it with a TTL SLR. Thanks Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] box camera dimensions
Book knowledge : Ansel Adams in Camera Lens makes reference to light flare problems with a bellows not much larger than the film holder, and that he blamed everything else before figuring out what it was. I imagine with a smooth-sided box it could be equally as bad or worse...I would make the back wider. I am tempted to put trapezoidal pieces together to make a pyramidal box, but would have to reply on someone else to cut it for me. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Reusing Polaroid Land Cameras???
Hello: I was looking in a store today and they had three different Polaroid Land Cameras for $8 each. One was a model 85 the other might have been 66 or 96 and I don't remember the other. 2 looked like they said something about 3000 speed film, didn't notice the other. These actually had metal parts! Pre-plastic-era. They had folding bellows too. Looked like smaller than 4x5 but I don't know the size. The salesman assumed unavailable film and thought one used roll film. (Did Polaroid make self-developing roll film?) Are these adaptable to anything along the lines of our interests? It was also interesting to see a new Polaroid bellows camera with side mount flash gun...I forgot what they called it, and I sure didn't ask what it costs. Murray --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Graflex focal plane shutter patent?
I'm curious if any of the Graflex FP shutter cameras being discussed have patent numbers available. (?) I am getting pretty good at finding patent info on my own now, but you'd save me a lot of looking if there are numbers available already. I read the patents to help me understand how certain features worked and to help me figure out an economical way to do it myself. Thanks Murray. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Optics thanks
Thank you. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] dumb questions answered
I found a website with an optics-as-related-to-photography FAQ file with a technical bent. http://www.photo.net/learn/optics/lensFAQ I made the an observation about the following question/answer What is the basic formula for the conditions under which an image is in focus? A. There are several forms... 1/Si + 1/So = 1/f (Gaussian form) The answer has the same form as the formula for parallel resistors (electrical analogy), and I find the following calculation easier: f = (So*Si)/(So+Si) (product /sum) I'm noot sure what the answer 'f' means, however...if I use the numbers Si = 150 mm and So = 900 mm, envisioning an object 900 mm away from the lens and 150 mm between the lens and the film, which seem reasonable for a 4 x 5 camera... The result is 128.6 mm. I don't understand if this answer represents a physical distance, a focal length or what else... the distance between lens and object and lens and film were specified, so I don't know what else there is to figure out here. If it is focal length, that sounds like cart-before horse...one has limited focal lengths to choose from...whatever fixed lengths the lenses come in. I can do the math, but making it mean something is not working for me. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Aero-Ektar resolution
I saw a listing on eBay once, I think from Switzerland, for an Aero-Ektar 610 mm f/6 lens and he was quoting from supposed specs, and the resolution was quite high, or so it seemed to me. If I recall he then went on claiming how wonderful the color was. He had it mounted on some kind of view camera, but I don't remember it being bigger than 4x5...maybe I'm wrong. All I know is if the shutter was still on it it would probably only fit on a monster process camera...the lens board has to be big. I was surprised at claims the color prints were magnificent. Eastman House says this is one of the definitely radioactive lenses and if someone doesn't see radiation browning they're not checking for it. Same for the 305/309 mm f/2.5 cousins. So there's an alleged photographer with this lens. Apparently the 178 f/2.5 isn't radioactive. White paper behind the lens is supposed to reveal discoloration. I have a 60's edition of a Photogrammetry manual that discusses the theoretical resolution of the Metrogon lens at 230 l/mm, but that in practice it is actually much lower. I hope I'm wrong, but I seem to remember less confidently a number like 30 l/mm, and possibly not from the same book (could have been an Internet pseudo-reference). Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] scanning mf/lf negs and monrail technical question
Hello: I was given an HP ScanJet 3C. I don't see much advantage other than that it was probably made like a tank, it's 600 DPI optical , it's 14 long instead of 11.7 and there was a transparency adapter available that looks like it might have done 4x5. It came with the SCSI card and cable so no hardware surprises there. Is it worth looking for a used trans adapter for it? I figured most people would be thinking about updating to smaller faster etc. Has anyone built a monorail or other camera with ruler scales on it? I am right now interested in learning how those are used (the math behind image and object distance and size, all as they relate to f.l. ???). What I found in graphic arts textbooks was oversimplified to scaling monographs, with no understanding required. I think I need to understand how and where such a scale needs to be installed and used. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] mouth pinhole camera
I know this has come up before, but not my silly comments - I hope wasn't one of those photographers that wants to be able to expose and develop all in one container! Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] sick sick habit
Against the better judgement and advice of list members, I was unable to resist a lens that will mate with the 23 x 35 bellows I acquired. I know someone will be able to say...'Nyuah, nayh, I told you so, but it was irresistible. 27 f/8 from a 48 x 60 high resolution camera. I'm afraid it won't be very portable, however. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Cameramakers digest, Vol 1 #514 - 4 msgs
:O) OK - (O: I'm still chuckling. Murray - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, October 15, 2002 2:07 PM Subject: Cameramakers digest, Vol 1 #514 - 4 msgs Send Cameramakers mailing list submissions to [EMAIL PROTECTED] To subscribe or unsubscribe via the World Wide Web, visit http://rmp.opusis.com/mailman/listinfo/cameramakers or, via email, send a message with subject or body 'help' to [EMAIL PROTECTED] You can reach the person managing the list at [EMAIL PROTECTED] When replying, please edit your Subject line so it is more specific than Re: Contents of Cameramakers digest... Today's Topics: 1. pics to follow up to bellows questions (Uptown Gallery) 2. Process lens (Uptown Gallery) 3. Re: Process lens (John Cremati) 4. Re: Bellows Material Cordura (J. Wayde Allen) --__--__-- Message: 1 From: Uptown Gallery [EMAIL PROTECTED] To: [EMAIL PROTECTED] Date: Sun, 13 Oct 2002 18:08:52 -0400 Subject: [Cameramakers] pics to follow up to bellows questions Reply-To: [EMAIL PROTECTED] www.uptowngallery.org/cambo_front.jpg www.uptowngallery.org/cambo_rear.jpg What is that thing in the front? It's raised, has slots holes in it. Can I remove it to have a flat smooth place to fit a lens board in? Maybe it's NOT a Cambo? Thanks Murray --__--__-- Message: 2 From: Uptown Gallery [EMAIL PROTECTED] To: [EMAIL PROTECTED] Date: Sun, 13 Oct 2002 19:40:30 -0400 Subject: [Cameramakers] Process lens Reply-To: [EMAIL PROTECTED] What is the longest f.l. process lens you folks have heard of or have in your collection? I would like to know what exists for the 23 x 35 bellows coming my way, rather than looking for something that doesn't exist. I could experiment with single elements for camera work, but enlarging would need a better lens(Yeah, I know, reality check is in order, but why not pursue it?) Thanks Murray --__--__-- Message: 3 From: John Cremati [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Process lens Date: Tue, 15 Oct 2002 09:52:23 -0400 Reply-To: [EMAIL PROTECTED] They have a 72 inch focal length process lens but they are very rare, in fact I have never seen one for sale... I have seen a number of 48 inch and 42 inch process camera lenses .. I have a late model 42 inch( or about 1050mm) Red Dot Altar with the Schneider name on it that I hope to put into a shutter.. ... They are getting pricey as well. My advice to you would be to forget that old bellows (maybe use it for Halloween as the giant man eating camera...) and design a camera around available film, a lens , available film holders , ect Then build the bellows to fit your specific film back and front standard.. A bellows will be the least of your problems in design and building such a camera or enlarger.. All of a sudden 10 years will go by with very little to show for it except a old bellows that has little use except for the massive camera it was originally designed for..Focus on what you need to do what you want to do and spend the bucks to get there if that is the case. The only thing that I can think of to do with that bellows that might have value would be to make a large pinhole camera ( you could also use a cardboard box.) Been there , done that . John Cremati. - Original Message - From: Uptown Gallery [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, October 13, 2002 7:40 PM Subject: [Cameramakers] Process lens What is the longest f.l. process lens you folks have heard of or have in your collection? I would like to know what exists for the 23 x 35 bellows coming my way, rather than looking for something that doesn't exist. I could experiment with single elements for camera work, but enlarging would need a better lens(Yeah, I know, reality check is in order, but why not pursue it?) Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers --__--__-- Message: 4 Date: Tue, 15 Oct 2002 11:44:58 -0600 (MDT) From: J. Wayde Allen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Bellows Material Cordura Reply-To: [EMAIL PROTECTED] On Sun, 13 Oct 2002, John Cremati wrote: Has anyone tried using Cordura Nylon as the outer layer in bellows fabrication ? It is supposedly the toughest fabric on earth and is water proof...( they are using it to make Fishing Waders...) The deener 160 blend seems to be there thinnest material as they are using it for clothing. http://www.cordura.com/ Any suggestions? Yes, works like a charm http://rmp.opusis.com/cameras/my4x5_2.jpg! - Wayde ([EMAIL PROTECTED]) --__--__-- ___ Cameramakers mailing list [EMAIL PROTECTED] http
[Cameramakers] pics to follow up to bellows questions
www.uptowngallery.org/cambo_front.jpg www.uptowngallery.org/cambo_rear.jpg What is that thing in the front? It's raised, has slots holes in it. Can I remove it to have a flat smooth place to fit a lens board in? Maybe it's NOT a Cambo? Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Process lens
What is the longest f.l. process lens you folks have heard of or have in your collection? I would like to know what exists for the 23 x 35 bellows coming my way, rather than looking for something that doesn't exist. I could experiment with single elements for camera work, but enlarging would need a better lens(Yeah, I know, reality check is in order, but why not pursue it?) Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Quest for arcane knowledge - Xenon arc lamps for enlarger - vs cold light
I actually did find a web site with an academic discussion of designing various arc lamp power supplies, so who knows, I might end up trying that someday (I'm high voltage-savvy). The lamps are getting scarcer, at least as far as new from the manufacturer is concerned. I sure do like the idea of a serpentine cold head vs. the potential fire and brimstone of an arc lamp behind your negs. Someone told me he just went to his local shop had a custom grid lamp made for his panoramic enlarger, but I haven't found any neon shops in my state yet who knows a fraction of what I've learned in a few emails and a few web sites - and none of them use fluorescent tubing. There's always Aristo and LCDL and someone in Maryland, but thus far I'm having a hard time getting a response about a one-piece order for a lamp and transformer only. I'd still like to find out from someone how far a cold head will 'project', in other words, how large an enlargement can one make from the various formats with a cold head...do you just have very long exposure times if it's a large print (long distance)? I'm thinking horizontal enlarger. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] enlarger question
Hello: I previously got some aerial lenses to make a large format camera with. I just got an Ilex Paragon process lens that might (probably no question there) be easier to use. Got home late just dragged it into the garage - didn't find out if it has a shutter or what other electrical device was attached. (Previous question on list). I am also interested in a LF horizontal enlarger...trying to decide whether to make a camera convertible to enlarger a la Ansel Adams or decide what lens will be best where. Does anyone think any of the following lenses will serve well as a LF enlarger lens for b/w only? 153.2 mm f/6.3 Eastman Kodak (looks just like Metrogon came from K-17 aerial camera)...for 9x9 format. has between-lens iris shutter 305 mm f/2.5 Aero-Ektar in barrel with iris but no shutter (f 2.5-11; someone stamped iris ring with mark for f/16). 610 mm f/6 Aero-Ektar with between lens iris shutter. I have seen 178 mm f 2.5 Aero-Ektar's referred to as enlarger lenses, so I had hope one of the others would work. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Thanks camera/enlarger reply
I have the 4 basic AA books (don't have Artificial Lighting book). Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] basics of using view camera as enlarger
Hello: If this is an appropriate venue to discuss this topic, I'd like to hear from people who have used their view cameras to make an enlarger - whether a minimalist approach (mine) or not. Just looking for some basics or reading material so I don't have to 'reinvent the wheel'...someone else's experience on how much room is needed, how rigid the structure needs to be, etc. I'm interested in building 8 x 10 (or so) camera/enlarger. Probably use a homebrewed cold head, have a 15 process lens coming, and have a too-big (18 x 24) bellows...might look for something smaller. I gather (dumb question - I haven't built or used a view camera yet - so I have no practical understanding other than what I read) a bellows really IS necessary...can't just move the enlarger head up down because the negative-lens distance relates to the lens to paper distance. A box camera fixed at infinity is do-able, but for an enlargerh, I guess that would severely restrict the flexibility if it would be very useful at all. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] question and apologies for virus
Hello: I have been fighting with upgrading my AV software and got bit by an address-book virus today or yesterday - and I sure heard about it from everyone else's AV software that was working. I must have gotten 50 rejection messages! It was one of those Klez.H variations and it infected some weird things like my CD-R software (which was deleted and now has to be reinstalled). And my question - I bought (eBay - haven't received yet) an Ilex Process Paragon lens with some sort of motorized sliding scaling device (copy ratio I presume) 15 f/9 lens. This would be 381 mm..not quite 11 x 14 diagonal...maybe 10 x 12. 1) I am going on the assumption that process lenses make good enlarger lenses 2) What happens if 'too long' a lens is used for smaller format, say 8x10 or 5x7 negs...does it just mean enlarger starts out with a larger than 'normal' enlargment ratio? I know what happens from a camera point of view, but don't know what happens if I plan on using one enlarger lens for a variety of formats (for budget reasons). 3) Is this a good, excellent or barely decent lens for this application (and maybe a convertible camera/enlarger kluge)? Thanks . Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Ilex Process Paragon
http://www.uptowngallery.org/ilex1.jpg http://www.uptowngallery.org/ilex2.jpg If anyone can identify what the mechanism did, it would be appreciated. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] viruses
I have checked my PC with a current virus checker and apparently all is well. I still get responses back from mail servers blocking mail from my reply-to: address allegedly containing viruses. I think this is the other side of the coin with all the messages I get with weird attachments from people who didn't send them. I think it's a variation of an Address Book virus, and not necessarily the fault of the alleged sender. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Fluorescent replies - Bob M Panoramic AZ
Thanks Bob - I think in my case a little knowledge is dangerous - I worry more about what I do NOT know than what I do...with the hope that eventually when I know it, I'll be the first to know. And AZ (panoramic), I would like info (off list or on, whatever's appropriate) on custom lamp...I had thought about a neon place locally that makes weird custom neons. Are you talking about something similar to the 'grid lamps' Arista/o makes? Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Huw of LED fame on this list?
Is Huw of LED enlarger fame on this list? Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] thanks filmholder replies
thanks filmholder replies Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] repair of filmholder, Kodak 5x7 filmpack?
Hello: 1) When old filmholders develop cracks in, or loss of, the flexible hinge that swings open to slip film in and out of the film holder, what is appropriate to repair them with? I bought a roll of black photo tape from a photo store, and it was the first think I thought of. 2) In a box of 5 x 7 filmholders I got, was one different one that said use Kodak film pack. I have heard of these for 4 x 5 film, but are they still available for 5 x 7? ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] aristo cold head cost?
Hello: Anyone have an idea what an Aristo cold head for 8x10 enlarger costs? Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] ground glass
Hello: Has anyone ever tried 'non-glare' picture framing glass for ground glass, or is it not 'rough' enough? Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] ground glass spacing relative to film plane
Hello: This has probably been asked, discussed, etc. many times before, and maybe I've already asked. I haven't built a camera yet...still collecting parts and so on. If someone can please refer me to a website that discusses the requirements for spacing ground glass relative to the film holder focal plane, I will have a 'permanent' answer. Of course, replies to the list are appreciated...I think they get lost in my archives, and eventually when I start thinking about how to do something, I end up asking again. Since my wife I own a gallery frame shop, I have access to finished mouldings that would, in my opinion, make suitable standards for a view camera, and that's the direction I want to pursue. I usually see requests for sources of camera hardware, presumably 'proper hardware'...I am curious what people have adapted from others arenas to accomplish rise and tilt shift. Cosmetics are NOT especially important to me...I get satisfaction out of getting good results from ugliness. Thanks Murray Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] 10 kW UV enlarger and hello John.
Hello John: After reading Ansel Adam's reference to pulsed Xenon lamp enlargers and seeing a large format enlarger on the Internet owned by a guy in the Chicago area, I started looking into it myself. I found the lamps (on their way to obsolescence), and the 750 W and 1500 W ones were on the order of US$100, but the ballast (they call it a power supply; I think it has more than one voltage) was $1600 and $3050 respectively...that's out of the question. I have to dig thru my little black book and find names of people I knew in the lamp industry because I want to find out what the lamp operating starting and operating characteristics are...I'd consider winding my own transformer (!) because I've more experience doing that than coming up with spare K$. If you find any data along those lines, I'd be interested to mull it over. But it sounds like you're pursuing a different type of lamp, maybe...I'd worry about 'nuking' your negative with that much energy. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Cirkut camera
Hello: If there are patent numbers, you can probably do some research on US patent database. You can't search the old stuff by keyword, because the patent pages are saved as .tiff files. I had no luck with this aproach myself with either the Fairchild cameras/shutters or the Graphic focal plane shutter (the former had no patent numbers, and I couldn't find anyone who could check their camera for patent numbers for me (or forgot to get back to me). Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Cirkut patent numbers
Ah, I see further down in the digest someone has provided some patent numbers. I go to www.uspto.gov It takes a little while to figure out how to use the website. There is a download link there for a plug-in called alterna-tiff, which will allow .tiff files to be displayable in a browser. It will also allow you to save them to disk as individual pages. Patents run anywhere from 30-130 kB (approximately) per page, so long ones are tedious to download, but if you want to look before deciding to order them, it's great. I have patiently downloaded everything I want a page at a time and print them out on a laser printer. I haven't paid for any yet. You may need help from the reference librarian at a patent repository (like OSU, or whatever site handles it locally in your area). They can help you find patent numbers associated with the class numbers that relate to the item. If you look at one patent, right after the description, there is a class number. This is something to keep track of too if you want to find related things. The patent librarian I spoke with gave me a weird example - he said that electric shavers fall under some same classes as 'harvesting' equipment. This is what takes so %^@#%^ long to get patent applications processed, I guess. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Cameramakers digest, Vol 1 #430 - 5 msgs
Anyone have any references on 'pulsed xenon' lamp sources for large format enlargers? Ansel Adams mentions this in one of his Basic books, and I ran into someone's website once that built an enlarger with this source. I may have access to this technology thru work and want to start the learning curve to see if it's compatible with enlargment. Thanks Murray - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, July 02, 2002 2:07 PM Subject: Cameramakers digest, Vol 1 #430 - 5 msgs Send Cameramakers mailing list submissions to [EMAIL PROTECTED] To subscribe or unsubscribe via the World Wide Web, visit http://rmp.opusis.com/mailman/listinfo/cameramakers or, via email, send a message with subject or body 'help' to [EMAIL PROTECTED] You can reach the person managing the list at [EMAIL PROTECTED] When replying, please edit your Subject line so it is more specific than Re: Contents of Cameramakers digest... Today's Topics: 1. Re: Making a Spring Back (Philip willarney) 2. Re: Rule of Thumb for determining bellows size? (Robert Stoddard) 3. 8x10 enlarger (Philip J. McCourt) 4. Re: 8x10 enlarger (scl) 5. Re: Project Completed! (Terry) --__--__-- Message: 1 Date: Mon, 1 Jul 2002 12:36:58 -0700 (PDT) From: Philip willarney [EMAIL PROTECTED] Subject: Re: [Cameramakers] Making a Spring Back To: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] --- [EMAIL PROTECTED] wrote: A question about making spring backs http://home.online.no/~gjon/gg4x5.htm to be I've been working on building a 4x5 spring back myself, and the web site you list seems to have one of the prettier designs. If you can find a copy of Build Your Own View Camera!: An Easy and Inexpensive Passport to the Professional World of Photography for the Hobbyist by Bert West it's got plans for a simpler 4x5 back that should be easy to construct (I've got one mostly built from this one and am still looking for suitable springs). You can build this one with some thin plywood, some small wood stock, and very simple hand tools (say, a saw, a drill, and an exacto knife). Or, you can sometimes find just a 4x5 back -- I found one, a portion of an old view camera, for $10 at a camera show this spring: I'll probably cut it down to fit an old speed 3 1/4 x 4 1/4 I've got so I can use 4x5 film in it. Oddly enough, I've seen a few speed graphic backs on ebay -- but they wind up going for more than you paid for your camera... -- Philip -- [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com --__--__-- Message: 2 From: Robert Stoddard [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Rule of Thumb for determining bellows size? Date: Mon, 01 Jul 2002 20:25:09 + Reply-To: [EMAIL PROTECTED] Is there a rule-of-thumb when it comes to determing the size of the bellows to be used with any given format? I have recently started thinking about modifying my Toyo 23G so I can occasionally shoot 4x5 sheetfilm with it and while there is enough space between the the rear standard uprights to accept a 4x5 back, the opening in the rear standard is only ~4.5 square and the opening in the bag bellows mounting plate is just under 4 square. One way to minimize problems when adapting a larger back to a smaller camera is to provide that the back be spaced somewhat further away from (behind) the position of the normal-size back. This works to minimize image cutoff and reflections, because the light coming from the lens is in the shape of a cone, and a 4.5 inch aperture won't intercept the cone of light if the image plane and 4.5 inch aperture are separated a bit. RKS _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx --__--__-- Message: 3 Date: Mon, 01 Jul 2002 17:45:40 -0400 From: Philip J. McCourt [EMAIL PROTECTED] To: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: [Cameramakers] 8x10 enlarger Reply-To: [EMAIL PROTECTED] I finally have some of the 8x10 enlarger built. I have posted info and some photos of it on my website. Keep in mind that this is a work in progress and changes will be made as I complete the building process. I have tried projecting a negative on a movie screen and the results look very promising. Any comments would me welcomed! http://www.philsan.com/8x10_enlarger.htm Phil McCourt --__--__-- Message: 4 Date: Mon, 1 Jul 2002 20:13:47 -0400 (EDT) From: scl [EMAIL PROTECTED] To: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: Re: [Cameramakers] 8x10 enlarger Reply-To: [EMAIL PROTECTED] On Mon, 1 Jul 2002, Philip J. McCourt wrote: I finally have some of the 8x10 enlarger built. I have posted info and some photos of it on my website. Keep
[Cameramakers] Glass mfg technology
I was under the impression that picture framing glass as well as mirrors are 'float glass'. We occasionally pull a piece of clear framing glass that has tin residue on it. The glass is certainly not optical quality, however. Once, Tru-View Glass let me speak with a quality engineer and I got a lot of info on what is and isn't allowed to pass as defects, but ever since I can't get past customer service who knows nothing more than what's written on the box. You will occasionally find bubbles, etc. If it can't be seen from 3 feet away in the center or 9 feet at the edges, they let it go out the door. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] focal plane shutter theory of operation
Hello: Can someone either explain or refer me to something explaining the theory of operation of a focal plane shutter? Are there single and double curtain ones? What determines the limits of their usability? I hear of certain photos revealing problems with FP shutters? All this is heading toward a homebrew FP shutter...any info on that would be appreciated too...I found a 1999 archive from a guy in the UK who had a pre-WW I book discussing homebrew FP shutter. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Aero-Ektar lenses
Hello: I lost out on two eBay auctions for large Aero-Ektar lenses last week. I realize they have a host of quirks ranging from mechanical issues with integration into a camera to discolored optics and radioacivity due to thorium oxide in the rear element. But they are 'cool'. Before I embark on another hunt for one, can someone confirm whether they're worth the effort to adapt for a camera. I planned on building a box or bellows camera around one, and really don't care that a external shutter is required. Someone told me the 'air space' between the back of the lens and the shutter has to be 'right'...I presume that means the spacing. I would think the spacing between a lens and a combination iris/shutter would be important because the iris size is variable. I would think a rear mount shutter with out iris that opened all the way wouldn't be that critical. Comments appreciated. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Cameramakers digest, Vol 1 #345 - 4 msgs
Local hospital told me they do both digital and film...film is more secure in the event of technical difficulties, but digital is able to do more - color, digital signal processing, etc. Murray - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, February 19, 2002 2:07 PM Subject: Cameramakers digest, Vol 1 #345 - 4 msgs Send Cameramakers mailing list submissions to [EMAIL PROTECTED] To subscribe or unsubscribe via the World Wide Web, visit http://rmp.opusis.com/mailman/listinfo/cameramakers or, via email, send a message with subject or body 'help' to [EMAIL PROTECTED] You can reach the person managing the list at [EMAIL PROTECTED] When replying, please edit your Subject line so it is more specific than Re: Contents of Cameramakers digest... Today's Topics: 1. missile lens (Murray) 2. 11x14 film holders (Frank Earl) 3. Re: missile lens (Robert Mueller) 4. Re: missile lens (Gene Johnson) --__--__-- Message: 1 From: Murray [EMAIL PROTECTED] To: [EMAIL PROTECTED] Date: Mon, 18 Feb 2002 18:45:16 -0500 Subject: [Cameramakers] missile lens Reply-To: [EMAIL PROTECTED] There is one on eBay right now...the seller is in E. Michigan. Is there a consensus on the lenses that have barium (or whatever) glass that emits alpha and beta radiation? Avoid, or just store in the back yard in a bunker? Murray --__--__-- Message: 2 Date: Mon, 18 Feb 2002 23:29:31 -0800 (PST) From: Frank Earl [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: [Cameramakers] 11x14 film holders Reply-To: [EMAIL PROTECTED] I have been told that film holders for x-rays will work as 11x14 film holders in standard cameras of that format (if there is such a thing). I thought I would let members of this list know. I would assume that many hospitals are going to digital and surplus sales of these could get someone started on a nice project. If anybody knows for sure, would you please post a response. __ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.com --__--__-- Message: 3 Date: Tue, 19 Feb 2002 11:11:02 +0100 To: [EMAIL PROTECTED] From: Robert Mueller [EMAIL PROTECTED] Subject: Re: [Cameramakers] missile lens Reply-To: [EMAIL PROTECTED] I think that if some element is a problem, it is thorium. It has been used, but is not exactly a common component in glass, though some military optics are easily available with thorium. I cannot find any radioactive isotope in a table showing what is in natural barium. The element is often used internally (in people) as a contrast agent during X-ray investigations; that does not say it is definitely not radioactive but it does say it is pretty un-threatening! Unless an element of the lens is facing the outside, any alphas or betas will not reach film or the user as long as the lens stays assembled. Some of these radiations would get out if the thorium bearing element is an outer element. Even then, any alphas would not reach film unless the lens has a focal length shorter than about 100 mm (actually, the back element would have to be closer than 100 mm or so for alphas to reach thj4e film, which is not quite the same thing.) Somewhat more threatening would be any gamma emitters, whether from the thorium itself (I did not check whether it also emits gammas) or from any daughters in the decay chain. These can escape even through glass and go a long way in air but they are also less damaging than alphas, which are nasty (If one hits you it WILL stop in your tissue; in contrast, a gamma might pass right through you (depending on its energy and probability); thus a few gammas are little cause for worry.) (Do you know YOU are radioactive and if you were not you would almost surely be DEAD already. Potassium 40 is weakly radioactive and yet your body would not function without it. In addition, carbon in living tissue is partly C14(radioactive with a half-life around 5000 years), and NO known living organism gets along without carbon. In addition, we all harbor some stray radioisotopes which do only a little harm, just as the K40 and C14 do only a little harm while potassium and carbon do immense good!) In short, don't panic but don't sleep with your Aero Ektars. Bob At 18:45 18.02.02 -0500, you wrote: There is one on eBay right now...the seller is in E. Michigan. Is there a consensus on the lenses that have barium (or whatever) glass that emits alpha and beta radiation? Avoid, or just store in the back yard in a bunker? Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers --__--__-- Message: 4 From: Gene Johnson [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] missile lens Date: Tue, 19 Feb 2002 08:04:01 -0800 Reply-To:
[Cameramakers] hyperfocal distance and lens construction
Hello: Can someone refer me to (or explain to me) what hyperfocal distance is (and how to apply it to lens construction/use)? I want to experiment with some single meniscus and achromat lenses. I picked up an electronic shutter on eBay and am trying to get some ideas about how far to position the lens from the aperture. Also, how hard is it to obtain a threaded mounting or retaining ring for the threads at the back of the shutter and a 'threaded tube' to mount the lens with for the inside thread of the shutter? I have an Ilex #1 synchro electronic shutter, which I have not been able to find specific information on. I am going to try my hand at measuring the thread diameter and pitch (not sure my eyes will cooperate with the latter) and comparing to any other data I can find (I found MellesGriot data, but no guarantee there is similarity). Thank you. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] fluorescent ballast circuit
I got a magazine in the mail yesterday that has a 7 watt compact fluorescent lamp electronic ballast circuit in it (hot, not cold cathode) that runs off 12 V DC. If anyone is interested, let me know. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] cannibalizing lens for elements and Ilex #1 shutter
Hello: Thanks for the encouragement...I've dissassembled the optics side of my old 35 mm format Retina-Tele-Xenar lens to inventory the optics and see what was usable. I wish the iris side had been that easy...that was it's problem. If I project an image of say, a light fixture onto a wall, intuitively I would expect the distance from the image side of the lens to the projected image would be the focal length. Please tell me if I'm wrong. There is one assembly that looks like a doublet (maybe a triplet?...hard to tell how many pieces looking at the edge), maybe 37-40 mm diameter (didn't measure yet), maybe 10-12 inch f.l.; didn't have a ruler handy. I also won an eBay auction tonight for an Ilex #1 synchro shutter with 2.8-16 iris...maybe I can use this for something MF/LF. I am still puzzling over how to determine how large an image it will make...holding the lens element alone, I can only project whatever bright object I can find...usually a light fixture across a room. I can't see much else. Someone a while back suggested mounting the lens in a dark box with a makeshift ground glass spaced at the f.l. and see what I can see...sounds good but involves some work ...anything simpler for an immediate answer, or do I have to earn it? Now to figure out how to kick start the Ilex shutter. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Recent post here? by large simple-lens camera builder
Hello: I recently read a post by someone who is testing an 11 x 14 box camera before embarking on a 20x24 rollfilm camera... Are you on this list? Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] acid
I think HF (hydrofluoric is the acid of choice for glass etching). I was thinking of asking a local glass etcher, but the suggestions of acrylic and another of glassine paper between two sheets of glass look liek enough to keep me busy for a while. Murray
