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#1
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Infrared light leak
Last night I was developing some sheet film in my darkroom. I'm always on
the alert for "light leaks," because the darkroom is a converted bedroom. I kept getting the annoying feeling that some light was leaking in from around the main door. But whenever I looked directly at the door, I couldn't pinpoint any leaks. It bugged me. Today I fished-out my infrared night vision monocular, figuring that since it amplifies available light tens of thousands of times, it would reveal any leaks, no matter how small. I panned around the room, and when I came to the door, I stopped in amazement. What I saw looked like an x-ray of the door! I could clearly make out the rectangular outline, and several thin, horizontal opaque strips, along with one large opaque rectangle around the doorknob. What I was seeing was infrared light penetrating the veneer of the door, as well as the horizontal re-enforcement strips of solid pine, and the re-enforcement plate around the doorknob! So, in addition to plastic body cameras, I guess we need to be aware that some "solid" doors aren't! My solution was simple: I painted both sides of the door in flat black paint. The pigment in the paint *is* IR-opaque. -- Theo Benson, Grizzly Glen Photography www.chameleon.net/ursus |
#2
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Infrared light leak
Infrared night vision monocular indeed!The first time I saw such a thing was
in the army.I hope I will never, ever need to use one, because that would mean a war. -- Dimitris Tzortzakakis,Iraklion Crete,Greece Analogue technology rules-digital sucks http://www.patriko-kreta.com dimtzort AT otenet DOT gr the return adress is corrupted Warning:all offending emails will be deleted, and the offender/spammer will be put on my personal "black list". Ο "Ursus Californicus" έγραψε στο μήνυμα hlink.net... Last night I was developing some sheet film in my darkroom. I'm always on the alert for "light leaks," because the darkroom is a converted bedroom. I kept getting the annoying feeling that some light was leaking in from around the main door. But whenever I looked directly at the door, I couldn't pinpoint any leaks. It bugged me. Today I fished-out my infrared night vision monocular, figuring that since it amplifies available light tens of thousands of times, it would reveal any leaks, no matter how small. I panned around the room, and when I came to the door, I stopped in amazement. What I saw looked like an x-ray of the door! I could clearly make out the rectangular outline, and several thin, horizontal opaque strips, along with one large opaque rectangle around the doorknob. What I was seeing was infrared light penetrating the veneer of the door, as well as the horizontal re-enforcement strips of solid pine, and the re-enforcement plate around the doorknob! So, in addition to plastic body cameras, I guess we need to be aware that some "solid" doors aren't! My solution was simple: I painted both sides of the door in flat black paint. The pigment in the paint *is* IR-opaque. -- Theo Benson, Grizzly Glen Photography www.chameleon.net/ursus |
#3
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Infrared light leak
Now being used by sports enthusiasts everywhere, and have been used in
commercial darkrooms for years to load film and recover films dropped on the floor during the loading process. Kodak even makes an IR filter for their safelite housing. -- darkroommike ---------- "Tzortzakakis Dimitrios" wrote in message ... Infrared night vision monocular indeed!The first time I saw such a thing was in the army.I hope I will never, ever need to use one, because that would mean a war. -- Dimitris Tzortzakakis,Iraklion Crete,Greece Analogue technology rules-digital sucks http://www.patriko-kreta.com dimtzort AT otenet DOT gr the return adress is corrupted Warning:all offending emails will be deleted, and the offender/spammer will be put on my personal "black list". Ο "Ursus Californicus" έγραψε στο μήνυμα hlink.net... Last night I was developing some sheet film in my darkroom. I'm always on the alert for "light leaks," because the darkroom is a converted bedroom. I kept getting the annoying feeling that some light was leaking in from around the main door. But whenever I looked directly at the door, I couldn't pinpoint any leaks. It bugged me. Today I fished-out my infrared night vision monocular, figuring that since it amplifies available light tens of thousands of times, it would reveal any leaks, no matter how small. I panned around the room, and when I came to the door, I stopped in amazement. What I saw looked like an x-ray of the door! I could clearly make out the rectangular outline, and several thin, horizontal opaque strips, along with one large opaque rectangle around the doorknob. What I was seeing was infrared light penetrating the veneer of the door, as well as the horizontal re-enforcement strips of solid pine, and the re-enforcement plate around the doorknob! So, in addition to plastic body cameras, I guess we need to be aware that some "solid" doors aren't! My solution was simple: I painted both sides of the door in flat black paint. The pigment in the paint *is* IR-opaque. -- Theo Benson, Grizzly Glen Photography www.chameleon.net/ursus |
#4
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Infrared light leak
And this is a good point to remember if you shoot EIR (Kodak's false-color
IR slide film): make sure the lab does NOT use darkened rooms and IR goggles for the technicians running the processors. Many labs do, and it can kill your film. My old lab held the IR stuff for the last run of the day, and the technician simply turned his goggles off before loading the machine. -- Theo |
#5
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Infrared light leak
I think there are automated processing machines that use infrared light to
sense the position of the film. EIR comes back uniformly deep red when this is done. One lab that can do it correctly is www.colorchrome.com. "Ursus Californicus" wrote in message link.net... And this is a good point to remember if you shoot EIR (Kodak's false-color IR slide film): make sure the lab does NOT use darkened rooms and IR goggles for the technicians running the processors. Many labs do, and it can kill your film. My old lab held the IR stuff for the last run of the day, and the technician simply turned his goggles off before loading the machine. -- Theo |
#6
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Infrared light leak
Yes, some of the processors (I think mainly the older ones) use IR film
position sensors, and they will obliterate EIR. I make it a point to ask for the manager if I'm using a new lab, and ask about their machines before leaving my film. Oh -- and I put packing tape across the film capsule and write "IR - do NOT open in light!" on it. This is because I once took a roll of EIR into a "pro" lab, and even as I was warning the counter guy not to open the capsule, he opened it. Fortunately, I screamed loudly enough, and his reaction time was good enough, that he slammed the cap back on, I only lost four images, and I got the processing and a new roll for free. }:xD -- Theo Benson Grizzly Glen Photography www.chameleon.net/ursus |
#7
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Infrared light leak
All the EIR i've ever shot has been hand processed. Not sure if I've
ever even known any labs that walk around with ir goggles. And if they do so when developing IR film then they shouldn't be developing my film anyway On Sun, 13 Jun 2004 15:01:53 GMT, "Ursus Californicus" wrote: And this is a good point to remember if you shoot EIR (Kodak's false-color IR slide film): make sure the lab does NOT use darkened rooms and IR goggles for the technicians running the processors. Many labs do, and it can kill your film. My old lab held the IR stuff for the last run of the day, and the technician simply turned his goggles off before loading the machine. -- Theo Cheers, -sd http://www.zoom.sh |
#8
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Infrared light leak
Maybe I don't get it but...If you take risky film to a lab and they do
exactly the opposite of what you tell them, destroy four of your images (which could have been the 4 you wanted), and then offer a free roll and processing, I think I'd probably ask them for cash money and never come back again. Another thing I don't get is the EIR film and the "capsule". If you're talking about the film cannister that the EIR comes in, i'm not sure why opening that would expose any of the images in the roll unless the actual film container was broken. I've shot dozens of rolls of EIR and developed them without any fogging/destruction regardless if the roll was protected by its original cannister... On Sun, 13 Jun 2004 17:14:40 GMT, "Ursus Californicus" wrote: Yes, some of the processors (I think mainly the older ones) use IR film position sensors, and they will obliterate EIR. I make it a point to ask for the manager if I'm using a new lab, and ask about their machines before leaving my film. Oh -- and I put packing tape across the film capsule and write "IR - do NOT open in light!" on it. This is because I once took a roll of EIR into a "pro" lab, and even as I was warning the counter guy not to open the capsule, he opened it. Fortunately, I screamed loudly enough, and his reaction time was good enough, that he slammed the cap back on, I only lost four images, and I got the processing and a new roll for free. }:xD -- Theo Benson Grizzly Glen Photography www.chameleon.net/ursus Cheers, -sd http://www.zoom.sh |
#9
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Infrared light leak
"Some Dude" wrote in message ... Maybe I don't get it but...If you take risky film to a lab and they do exactly the opposite of what you tell them, destroy four of your images (which could have been the 4 you wanted), and then offer a free roll and processing, I think I'd probably ask them for cash money and never come back again. Another thing I don't get is the EIR film and the "capsule". If you're talking about the film cannister that the EIR comes in, i'm not sure why opening that would expose any of the images in the roll unless the actual film container was broken. I've shot dozens of rolls of EIR and developed them without any fogging/destruction regardless if the roll was protected by its original cannister... I, too, have handled EIR cassettes in ordinary room light several times without any fogging. Nothing extreme like direct sunlight, of course -- but no problems indoors. |
#10
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Infrared light leak
Kodak's black and white infrared is coated onto a thin "Estar" (polyester?)
base material and is notorious for "light piping"--the room light follows the leader into the cassette and fogs the film, additionally the Kodak felt on the cassette lips is not very IR tight either. But the color film is on a standard acetate base and does not have the same special problems as the black and white stuff. -- darkroommike ---------- "Michael A. Covington" wrote in message news "Some Dude" wrote in message ... Maybe I don't get it but...If you take risky film to a lab and they do exactly the opposite of what you tell them, destroy four of your images (which could have been the 4 you wanted), and then offer a free roll and processing, I think I'd probably ask them for cash money and never come back again. Another thing I don't get is the EIR film and the "capsule". If you're talking about the film cannister that the EIR comes in, i'm not sure why opening that would expose any of the images in the roll unless the actual film container was broken. I've shot dozens of rolls of EIR and developed them without any fogging/destruction regardless if the roll was protected by its original cannister... I, too, have handled EIR cassettes in ordinary room light several times without any fogging. Nothing extreme like direct sunlight, of course -- but no problems indoors. |
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