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Thread: c41 dip'n'dunk overdeveloped corners

  1. #1

    Join Date
    Feb 2015
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    1

    c41 dip'n'dunk overdeveloped corners

    Hello fellow scheimpflugers!

    I am in school at present with a c41 dip'n'dunk machine at my disposal. Quite a luxury, however, I keep getting overdeveloping around where the clamps grip the (4x5)film.
    It happens quite often but in a seemingly arbitrary way - sometimes the corners on the left have the problem while the right side is totally fine and sometimes it does not happen at all and sometimes all four corners are affected.
    I have tried washing the frame and clamps thoroughly before use but that doesn't fix the problem.

    Does anyone in here know what might be the problem?

    thanks in advance!

    best
    Flemming

  2. #2

    Join Date
    Aug 2013
    Location
    Chicago
    Posts
    1,850

    Re: c41 dip'n'dunk overdeveloped corners

    What's your agitation cycle? I suspect you need less, and with less vigor. I find that it goes best when I move things very slowly, relying on drainage rather then vortex-like forces to move developer around. If you're going to be energetic, keep it short, rather than prolonged.
    Thanks, but I'd rather just watch:
    Large format: http://flickr.com/michaeldarnton
    Mostly 35mm: http://flickr.com/mdarnton
    You want digital, color, etc?: http://www.flickr.com/photos/stradofear

  3. #3

    Join Date
    Apr 2012
    Location
    Boston, MA, USA
    Posts
    1,506

    Re: c41 dip'n'dunk overdeveloped corners

    The problem is the pressure around the clamps before and during the process. There is no way around in dip and dunk, thats just part of the process. The solution:
    Do not use that 15% area of the negative, or do yourself a favor upgrade to a Jobo.

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