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  1. #11
    Ole
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    yes, we are essentially saying the same thing.

    HIE seems to be a fast emulsion (horrendous grain) which is only sensitised to red and IR; the blue/UV is the native silver halide sensitivity. MACO IR is a panchromatic film with extended IR sensitivity.

    BTW the Rollei IR 820/400 works fine with a 695 IR filter, and is fast enough with that to allow hand-held shooting. I tried it in a Bessa-L with 21mm Color-Skopar and a Heliopan filter; setting the speed dial to 200 gave good results measuring through the filter. It ended up at something like EI 20.
    -- Ole Tjugen, Luddite Elitist
    Norway

  2. #12
    Cor
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    Quote Originally Posted by Ole View Post
    yes, we are essentially saying the same thing.

    HIE seems to be a fast emulsion (horrendous grain)
    ..excellent for Lith printing though..


    Quote Originally Posted by Ole View Post
    BTW the Rollei IR 820/400 works fine with a 695 IR filter, and is fast enough with that to allow hand-held shooting. I tried it in a Bessa-L with 21mm Color-Skopar and a Heliopan filter; setting the speed dial to 200 gave good results measuring through the filter. It ended up at something like EI 20.
    ..interesting: to get a decent IR effect I had to use a 89c filter, at 8 asa..

    Best,


    Cor

  3. #13
    Ole
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    Cor,

    The sensitivity curve for Rollei IR 820/400 is here.

    I went for a Heliopan 695 filter since I wanted to keep as much of the IR sensitivity as possible while filtering out as much as possible of the visible light. A 720nm filter is better for blocking visible light, but cuts into the shorter bit of the IR.
    -- Ole Tjugen, Luddite Elitist
    Norway

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