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  1. #1

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    EXPOSURE CALULATION

    Assume an aperture of f/166 and an ISO 100 then

    f/128 at 64 is the same (2/3 stop)
    f/90 at 120 is the same
    f/64 at 250 is the same
    f/32 at 500 is the same

    So if I set the meter at ISO 500 take a reading and set the stop at 32
    it should tell me exposure time - reciprocity at f/166?
    It is easier to gain enlightenment than to explain enlightenment.
    Supreme Master Ching Hai

  2. #2

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    i believe the simplest way is to set your meter for f16 and iso 100, multiply the resulting exposure value by 100, and then adjust for reciprocity...

    good luck!

    -tom
    Last edited by tpersin; 04-14-2007 at 07:53 PM. Click to view previous post history.

  3. #3

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    Assume an aperture of f/166 and an ISO 100 then

    f/128 at 64 is the same (2/3 stop)
    f/90 at 120 is the same
    f/64 at 250 is the same
    f/32 at 500 is the same

    So if I set the meter at ISO 500 take a reading and set the stop at 32
    it should tell me exposure time - reciprocity at f/166?

    ok, now I have my Mind right. its:

    Assume an aperture of f/166 and an ISO 100 then

    f/128 at 64 is the same (2/3 stop)
    f/90 at 32 is the same
    f/64 at 16 is the same
    f/32 at 8 is the same

    So if I set the meter at ISO 8 take a reading and set the stop at 32
    it should tell me exposure time - reciprocity at f/166.
    It is easier to gain enlightenment than to explain enlightenment.
    Supreme Master Ching Hai

  4. #4
    Jim Noel's Avatar
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    If the camera uses 35mm, 120 or 5x4 film, use Fuji Acros and forget about reciprocity calculations. That is the only film I use in pinholes of these sizes.
    [FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]

  5. #5
    Helen B's Avatar
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    You missed out f/45:

    f/128 at 64 is the same (2/3 stop)
    f/90 at 32 is the same
    f/64 at 16 is the same
    f/45 at 8 is the same


    Best,
    Helen

  6. #6

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    Thanks!

    Assume an aperture of f/166 and an ISO 100 then

    f/128 at 64 is the same (2/3 stop)
    f/90 at 32 is the same
    f/64 at 16 is the same
    f/45 at 8 is the same
    f/32 at 4 is the same

    So if I set the meter at ISO 4 take a reading and set the stop at 32
    it should tell me exposure time - reciprocity at f/166.
    It is easier to gain enlightenment than to explain enlightenment.
    Supreme Master Ching Hai

  7. #7

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    or, another way, would be to set your meter for f16 and iso 100, multiply the resulting exposure value by 100, and then adjust for reciprocity...



 

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