[pure-silver] Re: link that pictures old film wrappings?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 16 May 2007 14:02:22 -0700
----- Original Message -----
From: "Janet Cull" <jcull@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, May 16, 2007 11:31 AM
Subject: [pure-silver] Re: link that pictures old film
wrappings?
I use the chart, but I don't see anything about older
versions of the film. Am I looking, but not seeing?
Please point me in the right direction if it's there and
I'm missing it. Thanks.
Janet
Just to add to the confusion-- There may not really be
two different versions of the emulsion. The "new" versions
of Tri-X and other Kodak films were released when the
company moved manufacture from the old film plant at
Rochester to the color film plant. It seems that T-Max was
always made in this plant. There was probably a new set of
sensitometric tests made on these films.
Kodak has both old and new data sheets on its web site,
or I can send you the PDF versions of them. Also, the
development recommendations for T-Max have changed a bit
over the time the film has been made. This is, again,
probably the result of later sensitometric testing. The
later data sheets also have developer combinations not
listed on the earlier sheets, both for Kodak developers and
others.
T-Max, and probably other thin-emulsion, tabular grain
films, tend to vary in contrast faster with variation in
development so closer control of time, temperature, and
agitation is necessary to get predictable and reproducible
results. Some of the small tank times given in the earlier
data sheets are too short for uniformity, the later data
sheets give times for diluted developers, particularly the
T-Max developers, which make it easier to control. IMO, tank
development times should be on the order of 8 minutes for
good consistency.
Probably Xtol is the optimum developer for T-Max since
it yields full speed, fine grain, and good sharpness. T-Max
and T-Max RS are best for pushing as is Microphen and Xtol,
Microdol-X or Perceptol yield finest grain at the cost of
about a stop of speed. I use Perceptol with 100T-Max for
35mm and find it gives me noticeably smoother tone rendition
than I get with other combinations, probably due to the
extremely fine grain.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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