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  1. #1

    Join Date
    Aug 2004
    Location
    Boulder, CO
    Posts
    46
    Comments
    20

    Default exposure question

    I have a quick question about exposure time...I am using oiled positives printed on a large format printer at kinko's (13x19). The black areas of the positives came out more of a dark gray, and I am concerned that light may be passing through this part of the positive during exposure.

    I know from doing a wedge test that the proper exposure time for my setup/emulsion is right at about an hour. My question is this: if i were to stack two oiled positives together to get a darker positive, how much time should I add to the exposure as a % of my known exposure time to compensate for the stacking (i would assume that less light will pass through two positives than one).

    thanks to anyone that can help,

    justin

  2. #2
    jasoncross's Avatar

    Join Date
    Mar 2002
    Location
    Austin
    Posts
    12,066
    Comments
    3412

    Default

    twice as long if you created twice the transparency.

    an hour is hella long though. using flourescents i burn my screens in 30 seconds using transparencies. that is a lot of time saved.

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