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Thread: IR Uses.

  1. #11
    winger's Avatar
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    The film is not that difficult to use, and remember that professional forensic photographers are -professional- and hopefully know what they are doing!
    Having worked as a forensic chemist with troopers doing the photography, I'm not going near that statement.

    BUT, IR film can be used to find gunshot residue around a bullet hole in dark clothing. I only saw it done during my internship (those guys were good), but it did work ok. The reason to do it would be to see how far away from the target/victim the muzzle of a gun was. In the lab where I worked, we used paper sensitized with chemicals that would react with the residues, so we didn't try the IR.
    IR can also be used in document exams, as mentioned. They have very cool gadgets for that now, though.

  2. #12
    matti's Avatar
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    What is the IR-output of ordinary flashes? Maybe an IR-filter over the flash would work?

    /matti

  3. #13

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    Quote Originally Posted by matti View Post
    What is the IR-output of ordinary flashes? Maybe an IR-filter over the flash would work?

    /matti
    Good question! Anyone?

  4. #14
    Ole
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    There were IR filters for the Metz 45 CT-series, and I think for several others including my Vivitar 265.
    -- Ole Tjugen, Luddite Elitist
    Norway

  5. #15
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    Quote Originally Posted by matti View Post
    What is the IR-output of ordinary flashes? Maybe an IR-filter over the flash would work?

    /matti
    In my experience with HIE IR output of electronic flash is same as for sunlight. I've used Photogenics and I meter the flash as for sunlight, personally I used EI of ~80, dev in D76 stock at 20C for the Kodak standard time. A couple of studio pics are in my APUG gallery.
    All history now of course since the film is discontinued.

  6. #16
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    This might be useful:

    http://www.rit.edu/~andpph/text-infrared-filter.html

    (making an improvised infrared filter)

    Bob M.

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