Archived posting to the Leica Users Group, 1999/08/09
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Dan,
You didn't mention B&W or color work...I am assuming B&W. There are =
many variables to contend with here:
1) If you print with coldlight, there is a phenomenon known as coldlight =
drift; this causes the light output to vary based on factors such as =
ambient temp, light tube temp, etc. This is why Aristo and others =
install thermostatic heaters in their heads as an attempt to minimize =
the drift by keeping the head at relatively the same temp for each =
exposure duration.
2) How much does your darkroom's ambient temp change during a printing =
session? Changes in air temp will, of course, cause the developer to =
heat/cool causing changes in print density.
3) What paper agitation technique do you use? Many people will argue =
that agitation doesn't affect print density results. Try it! Drop an =
exposed print into the developer tray and agitate infrequently...do =
another--same exposure, etc.--and agitate quickly, consistently, and =
thoroughly. Compare the two. Different is not the same!
I could go on, but the above gives you a few examples. Solutions? =
There are high-tech answers and very low-tech things one can do. To =
pursue the high-tech road, call Calumet Photographic for one of their =
catalogs describing darkroom equipment and look at the stuff Zone VI =
manufacturers. They have compensating enlarging timers that put an end =
to coldlight drift, and a really nifty compensating development timer =
that actually adjusts "clock speed" based on developer or waterbath =
temp. I have one of these and it's really quite amazing. Prints =
developed at 55 deg F will look identical to those done at 80 deg F; =
and, all will indicate 2 minutes on the timer!! Puts an end to summer =
and winter print density variation caused by developer temp changes =
during a printing session.
For a low-tech solution, Ansel describes a factor development kind of =
thing in, I believe, his Print book. Can anyone verify this? If I =
remember correctly, this technique involves locking down parameters =
based on when certain values appear as the print develops. All other =
print development times will be a factor based on the appearance of =
these same values.
Hope this helps. Good luck.
Best regards,
Alan Huntley
- -----Original Message-----
From: D Khong [SMTP:dkhong@pacific.net.sg]
Sent: Monday, August 09, 1999 4:12 PM
To: leica-users@mejac.palo-alto.ca.us
Subject: [Leica] Print Development Time
Friends
Presently, I am assessing the developing time for my prints visually. =
If I
want to produce two prints of similar nature this method may not be =
perfect.
I will appreciate your feedback as to how I might achieve better =
consistency.
TIA.
Dan K.=20
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