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IR pass material and the meaning of life...
Old 07-12-2005, 01:52 PM   #1 (permalink)
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OK. Nothing to report on the latter, but can anyone tell me if a piece of developed color film will work as an Infrared Pass filter? I'm using my on camera flash to trigger my strobes via optical slave, but the catchlights from the OCF are becoming a pain to edit out in post. Thanks ahead of time!
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Re: IR pass material and the meaning of life...
Old 07-12-2005, 02:13 PM   #2 (permalink)
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I heard in the past that you need to use a piece of Developed slide film...and use a frame that was not exposed. (all black)

I am not sure if a color negative would work...seems like it would have to be a fully exposed frame (all black) if it would.
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Re: IR pass material and the meaning of life...
Old 07-12-2005, 02:17 PM   #3 (permalink)
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I can't find it now but I recall reading that if you develop an unexposed sheet of Ektachrome 100 it will approximate a Kodak Wratten #87... or, you could order up a set of Kodak Wratten 87 (A,B&C) filters.

I've not done Ifra-red yet but I've been looking into it lately for some night shoots.
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Re: IR pass material and the meaning of life...
Old 07-12-2005, 02:36 PM   #4 (permalink)
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I'm not sure why you need a IR Pass material. If you're just wanting to stop the problem of the tiny catchlight from the On Camera flash used to trigger the strobes, then just put a bit of foil over the front to that blocks the flash from hitting the subject but still lets it trigger the flashes.
Cheers,
rfs
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Re: IR pass material and the meaning of life...
Old 07-12-2005, 04:03 PM   #5 (permalink)
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either what rfs said or you can get a "Wein Peanut" slave, connect it to the strobes, and put it in front of the OCF and cover the whole mess. It will act like a PC connection.
Mark
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Re: IR pass material and the meaning of life...
Old 07-12-2005, 04:31 PM   #6 (permalink)
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A developed piece of unexposed slide film will pass IR. I don't believe, although I haven't tested, that's true for color print film.

I did what you're proposing - made it easy to fire the strobes w/o altering the exposure, tripping over cords or spending money. Good luck.

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AMEN.
Old 07-12-2005, 05:08 PM   #7 (permalink)
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I hate spending just for the sake of a tool i can make myself.
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Re: AMEN.
Old 07-12-2005, 07:04 PM   #8 (permalink)
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Yep, and you can trust what Mr. Ford says too.
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Re: IR pass material and the meaning of life...
Old 07-14-2005, 07:47 AM   #9 (permalink)
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I use the leader that is given back in the package of photos, you know the part with the number that the lab uses to keep track of the film, cut to fit the window of my on camera flash. Also the RIT website spoke of the use of a piece of slide film developed but not exposed, to act as a filter that passes IR energy. I did it, works great.
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