Durst PIDAM enlargers (2501/2506/Optromat/Optopia) paper channel setup question

Discussion in 'Darkroom Equipment' started by Serg Lavrenchuk, Dec 6, 2013.

  1. Serg Lavrenchuk

    Serg Lavrenchuk Member

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    Hello, Sirs.

    I would like to ask advice from somebody who was making and remember details about setup of CP (paper channel) on this kind of enlargers.

    The main question is - what is realistic possible deviation obtainable. Is it possible to go that close to YMC = 1 1 1 as manual says?

    Maybe there are some tricks how manually to improve function of CP paper channel?
    Function of CP channel for negative color paper have a look like:

    F11
    T .. Y .... M . C . D . m
    4.1 - 59.1 - 42.3 - 0 - 30 - 6.380
    13.8 - 61.8 - 43.9 - 0 - 30 - 12.167
    46.4 - 63.1 - 46.1 - 0 - 30 - 22.493

    [sorry, can't format table well here]

    That is function of filtration to obtain neutral grey print from test neg of 0.7D grey on minimum (m=6.380), maximum (m=22.493) and middle (m=12.167) obtainable magnification factor with reference 150mm lens.

    The best possible deviation that I was able to get was C M Y / 2 3 4.

    I think partially that might be because of Crystal Archive paper that was stored for some 2 years in office conditions. (Do you think it is possible?)

    Do you have any advices how to get closer to the manual recommendations as for the deviations?