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  1. #21

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    I can see where the f-stop correction would be affected only by magnification.

    But, to what extent does reciprocity failure play a role when exposing photographic paper and adjusting the exposure time for the change in magnification.

  2. #22

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    Same as Film

    Quote Originally Posted by Neil Poulsen View Post
    I can see where the f-stop correction would be affected
    only by magnification.

    But, to what extent does reciprocity failure play a role
    when exposing photographic paper and adjusting the
    exposure time for the change in magnification.
    Reciprocity failure is a characteristic of the silver
    halides at very low levels of illumination. So, to
    avoid keep the lens open and the exposures
    short. Same as film. Dan

  3. #23
    BetterSense's Avatar
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    Or at least, keep exposure times the same. Then reciprocity failures should be no factor (other than for contrast which we assume we are controlling anyway).
    f/22 and be there.

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