Re: [Cameramakers] Cute little HP scanner; potential 4x5 back? Hmmm...
At 05:59 PM 9/19/2002 -0700, you wrote: --- [EMAIL PROTECTED] wrote: Hi, I'm trying to figure out how this would get done. Wouldn't you need to turn off the scanner lamp? ...snip... Yah, you need to turn off, disconnect, or cover the lamp. I've read about a couple of projects like this, including (drat, lost the web address) a fellow who turned a flat bed scanner into a panoramic camera by taking the guts out, disconnecting the light, mounting the sensor onto a pivot with a lens, and gimmicking the original motor belt to pivot the lens. Looked like it worked pretty well, and since it used the original electronics driver, it was real easy to use. I know one issue with doing this is that many scanner sensors are designed with baffles to only see light coming straight in, so light coming in at an angle (like most lens cameras have) isn't seen. I gotta get a working scanner to gut to try this, though. -- Philip All, That was Andy Davidahazy at RIT. You can dig it out here somewhere: http://www.rit.edu/~andpph/photoforum.html AZ Maker of Lookaround panoramic camera. http://www.panoramacamera.us or keyword.com lookaround ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] How to do it Booklets
I have found in my archives a series of booklets about 5 x 6.5 published by The Focal Press in the 40's I would judge. The titles are All about Making Darkroom Gadgets All about Building your own Enlarger( 2 copies) All about Portraits All about the Second Lamp All about Exposure All about lighting for Glamour All about Negative Retouching All about Filing All about Night Photography All about Improving Negatives All about Print Finishing(2 Copies) All about Against The Sun All about Composition All about Enlarging Gadgets All about Lighting Gadgets All about Making Camera Gadgets These are in pretty fair condition although one cover has become detached from the booklet. These run from 40 to 60 pages. In addition I found Making an enlarger from functional plans Guide to Retouching negatives and prints (Modern Camera Guide Series) I no longer have any use for these and am reluctant to go the ebay route. I need to know 1. Are they of use to any of you chaps 2. Can they produce a little pocket money for me. 3. If they go to someone it would be all or nothing as I cannot afford the time to send them one at a time. Your advice and help is solicited and will be appreciated. Jim Ketcheson Belleville, Canada Help is solicited and appreciated. I also can see a couple of more boxes in the back of the cupboard but am too tired to lug them out today. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] virus alert to fellows list members
My computer has been under attach, someone has been trying to pass the Klez virus into it. So far my virus program has caught them all. I only send emails through the list, I never send them directly to a list member. If you should get an email from Philsan or Phil McCourt off list do not open it. Respectfully, Phil McCourt ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Scanner now camera
I tried placing my flatbed behind 8 X 10. It worked very poorly. As was explained to me by several others before my test. First, the sensor needs to be directly behind the lens , on the centerline. My scans were dark at each end with a circle in the center. So you will see by looking at: http://www.rit.edu/~andpph/photoforum.html he rotates the lens / sensor assembly. Typical of panoramic cameras but also required to keep the sensor centered behind the lens. To find the drive hardware, the guts out of a scanner are a good start. Find an old inkjet printer, we all have a couple of those or are found for nothing in garage sales. The other issue is exposure. The good news is that daylight is much brighter than the lighting inside the scanner but out side light will easily over drive the sensor. The bad news is...look and the bulb. Notice how blue the light looks? That is because the sensor has maybe 1/2 to 1/4 the sensitivity to blue. This is made up in the bulb having more blue phosphors. You will need to color adjust after scanning. If there is no bulb they use LED's Also since the sensors were not really designed for sunlight you will get internal reflections off the glass cover and the sensors package as the glass is does not have antireflective coatings.You can try and minimize this by masking off the glass and just leave the slit over the sensor clear. The above was for lens reduction CCD based scanners As for specifically the 4 X 5 HP Scanner. Sorry to say but this use's the cheapest of all scanner sensors. About the only way the sensor in this unit will work is scanning the image off your ground glass. Because it already has what is called a self focusing lens as part of the sensor assembly. It uses LED's for the three different colors when scanning, and has a depth of field of only 1 or 2 millimeters. CRITICAL focus issue. The lens is plastic. It is really a relatively long tube for each pixel so its resolution is not good. About the only good thing I can say is that it might be portable. I could be wrong about a few points so if you have one just set it up behind your camera, throw a dark cloth over the back to keep light out and start trying to scan...even with the led's working. This will give some idea of the issues. Start at f16. If you are trying to scan the ground glass the led's will need to be turned off . Maybe not easy to do. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: CHEAP BALL SOCKET?? (filmpro)
I made my stands from 2 inch pvc pipe. Three 90 degree elbows for feet, two t fitting for the base. one for the three legs, one for the vertical pipe. john (:) - Message: 2 Date: Wed, 18 Sep 2002 19:41:13 -0700 From: filmpro [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: [Cameramakers] CHEAP BALL SOCKET?? Reply-To: [EMAIL PROTECTED] Hi! I'm building some flourescent lighting like kino Flo. I'm trying to figure an inexpensive way to connect the light unit, to a repurposed broken tripod (no head). A ball socket which could be locked at a specific angle would be great. So, where can i find such a thing cheaply. Or even make one. I will need 6-8 so price does become a factor. Also, Any ideas on cheap light stands? Need to be transportable. luckily I kept this broken tripod:-) Mac ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] fluorescent lamps for b/w LF cold head enlarger
Did we ever talk about using LED's for an enlarger? They have some pretty bright ones now. Maybe a real dense array of say white,blue,green yellow red. Maybe some could be turned off to change contrast? Just wondering out loud. Gene - Original Message - From: Uptown Gallery [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, September 19, 2002 10:01 PM Subject: [Cameramakers] fluorescent lamps for b/w LF cold head enlarger Hello: I am curious if anyone has ever used 'tri-phosphor' lamps for enlarging. I'm interested in an 8x10 enlarger for b/w only, on a budget. I started looking into low pressure pulsed xenon - lotta heat, and nearly obsolete, $100 for 750W lamp, $3000 for new commercial ballast/power supply, and it's not a friendly prospect - 52 V at about 18 amps plus 1 volt spike to ionize gas...so, I think I'll look into other approaches. Ansel Adams used massive array of logo-less incandescent lamps - heat again. I'm pondering either full spectrum fluorescent (linear tubes only as far as I know), or tri-phosphor complact fluorescent (3 spectral peaks spread out over visible spectrum depending on color temperature, 2700K, 3500 K, 4100K and 6500K available (CRI 82, but that may not be relevant to film). I got spectral plot of the 6500K one today because I was unfamiliar with that one, and the spikey spectrum of the tri-phoshor type does make me nervous...hence my request for others' fluorescent experience. What I'm considering is using seveal GE Biax (folded tube) 18 or 27W lamps for an 8 x 10 or 11x 14 head, each driven with a high frequency electronic ballast. Driving the lamps above 15kHz eliminates the 120 Hz (100 for 50 Hz countries) flicker and produces about 15% more lumens than line frequency. I have access to a manufacturer of small electronic ballasts (I used to work there). I am considering running them from a DC supply with individual regulators so the light output could be adjusted for each lamp. My main worry is the strong spectral peaks in this type of lamp. The intent of this lamp design is that the brain is supposed to 'fill in the spectral gap', and THINK they are full spectrum lamps. Thanks in advance for responses. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
