[pure-silver] Re: Contrast paper developer
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 20 Aug 2007 14:56:23 -0700
----- Original Message -----
From: "Ibrahim Pamuk" <ibrahim.pamuk@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, August 20, 2007 12:37 PM
Subject: [pure-silver] Re: Contrast paper developer
Your are right. It is also true that my negative quite
grainy when I complaint about contast. They are a little
over exposed infared negatives. I plan to go back to my
old condenser enlarger.
regards
Ibrahim Pamuk
Although the contrast is affected by the grain the
difference between a fine grain and coarse grain silver
negative should not be very much. There is a very large
difference in Callier effect between the dye image of a
color negative of transparency and a silver image but the
differences between various types of silver is not a lot.
One can assume about one paper grade difference between a
diffusion and condenser printer for these. Also, even if one
of the enlargers has a tungsten-halogen lamp and the other a
plain tungsten lamp the difference in color temperature
(assuming there is one) should not be enough to throw off
the grades given by printing filters or color head filters
by very much. In fact, the surface texture of the paper
should make a bigger difference. The contrast and Dmax are
reduced by matt surfaces so the actual contrast and density
range produced by the filters will vary with the surface on
any kind of paper. The rated values are usually for glossy
paper. In any case, the point I want to make is that the
very low contrast you have been getting is likely from
something other than the type of light source in the
enlarger.
Other than lithographic developers there is very little
difference in contast from one developer to another. The
so-called "soft" developers are, for the most part, just
slower to reach Dmax than "normal" developers. Some
emulsions are more variable than others but the effect of
the developer on paper is seldom even as much as one paper
grade.
It is often stated that condenser enlargers bring up
blemishes more than diffusion enlargers. This is to some
extent true but, if one is enlarging the same negative, the
somewhat lower paper contrast required for the condenser
enlarger will tend to suppress the blemishes so it all comes
out about the same.
Another thought: The settings for color head filters
for variable contrast paper are only approximate. They must
be the right settings for the particular brand of head and
paper. Most variable contast paper comes with recommended
settings on its data sheet. Usually the range of contrast is
less for the color head than for individual filters but the
spacings should be correct within that range. Usually only
the highest and lowest contrast values are not available
with the color head, the middle ranges are OK.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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