NetNews Usenet Archive 1992 #27/NN_1992_27.iso/spool/rec/photo/20035

Internet Message Format | 1992-11-18 | 1.7 KB

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From: [e-mail] (Michael C. Adler)
Newsgroups: rec.photo
Subject: Re: Setting up a darkroom...
Keywords: fogging, developers, darkroom, old enlargers
Message-ID: <[e-mail]>
Date: 16 Nov 92 19:51:31 GMT
References: <[e-mail]>
Sender: [e-mail]
Reply-To: [e-mail] (Michael C. Adler)
Organization: Digital Equipment Corporation
Lines: 25


Enlarger lens mounts are pretty well standardized on the Leica screw
mount.  If your Opemus lens board opening is too small then you have some
work to do but as long as the hole is large enough for the standard mount
you ought to be able to use a new lens.  Even if the hole is slightly
too large I would think you could use a pair of retaining rings, with
one on the outside acting as a washer, to keep the lens reasonably
stable.  The only other problem I can imagine is if the bellows don't
allow the lens to get close enough to the negative for focusing.

Indicator stop bath should be fine as long as it indicates good health.
You might choose to use a water rinse on film but I'd still use stop
bath for paper.

Testing for fogging is relatively simple.  Just keep in mind that exposed
emulsions are more susceptible to fogging than completely unexposed
ones.  The usual test is to start completely in the dark and make a
test strip under the enlarger to determine the maximum exposure such
that you perceive no darkening of the emulsion compared to an unexposed
border.  To test for fogging problems flash paper with this small exposure
and then wave the flashed paper wherever you wish to test for fogging
before developing it.

Enjoy,
-Michael