[pure-silver] Re: Judging Negatives
- From: Gerald Koch <gerald.koch@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 1 Nov 2010 06:50:23 -0700 (PDT)
It sounds like you are not exposing the film enough. Exposure controls density
while development controls contrast. Many books on photography have an
illustration showing a group of nine negatives of the same subject. The
negative in the center has correct exposure and development while the remaining
eight show all the combinations of incorrect exposure/density. This
illustration can be helpful in determining the properties of a problem negative.
In your particular case exposure two sheets of film. One with 1 stop more
exposure and one with 2 stops more exposure and check these for proper
exposure. Then make a print from each to check for contrast.
Old time photographers had a trick to evaluate negatives. First place the
negative on a newpaper. You should be able to just read the newspaper through
the negative. Now place the negative on a sheet of white paper to judge its
contrast. Do not attempt to judge a negative using backlighting as this result
in error.
Jerry
________________________________
From: Elias_Roustom <elroustom@xxxxxxxxx>
To: pure-silver@xxxxxxxxxxxxx
Sent: Mon, November 1, 2010 8:33:27 AM
Subject: [pure-silver] Judging Negatives
I'm still working with Efke 100 sheet film and HC110. I'm getting negatives
that
appear to be a stop off (too thin).
I know I should do a proper film speed test, but I'm thinking it's the
developer
- how I expose this film gives me good results with XTOL.
Is there a rule of thumb for how much more time in the developer will yield how
much more density in the film?
Or should I add a minute each time until I get what I want? Or am I better off
doubling my exposure?
Thanks,
Elias============================================================================================================To
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