[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

[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]

[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,

[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

[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

[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,

[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

[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

[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

[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

[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

[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

[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

[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

[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] 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] 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

[Cameramakers] thanks filmholder replies

thanks filmholder replies 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

[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

[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] 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

[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]

[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

[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] 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

[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

[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] 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

[Cameramakers] Re: Cameramakers digest, Vol 1 #514 - 4 msgs

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

[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]

[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

[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

[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

[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

[Cameramakers] Optics thanks

Thank you. ___ 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

[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

[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

[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

[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

[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

[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

[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

[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

[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

[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

[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

[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] 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

[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

[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

[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] 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] 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

[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.

[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

[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

[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

[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

[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

[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.

[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] 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

[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

[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

[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]

[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 /

[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

[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

[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

[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

[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] 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