[pure-silver] Re: Pushing Arista Edu?
- From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sat, 31 Jul 2010 07:27:14 -0400
Martin magid wrote:
> Has anyone pushed Arista Edu 100 one or two stops to 200 or 400 using
> D-76? If so, please post your method.
>
I never push film. It does not really increase the speed of the film.
Pushing seems to consist of developing the film longer, at a higher
temperature, or in a more active or more concentrated developer. All any
of that does is increase the contrast.
This can give the appearance of pushing the film, but the shadow detail
that is lost by underexposure does not appear by doing this. If the film
is developed normally to get the contrast you want, overdeveloping
merely raises the contrast, so what is there on the film will be too
contrasty. This may give a more acceptable appearance, using all the
zones of which the paper is capable, but it does not increase the speed
of the film.
About the only way the typical user can increase the apparent film speed
is to use two-solution development, soaking the film in the first
developer that lacks the the borax, Kodalk, or whatefer, until it is
saturated with developer, and then immersing it in the alkaline solution
until development is complete. I used to use D-25 for the first
solution, but developing it for a shorter time than necessary for normal
development and then completing development in the second solution.
Adding a little sulfite to the second solution is a good idea. I used to
use this as a compensating developer, but it does not compensate (in the
sense of rolling off the higher zones); it raises the density of the
lower zones. Trouble is that the contrast of the lower zones is reduced,
which is the opposite of what I normally would wish to achieve.
My solution, where higher speed from the film is required, is to use a
higher speed film in the first place. Or supplementary lighting (e.g.,
flash, reflectors, etc.).
--
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