No film gives an actual increase in film speed when pushed. All you can
do is underexpose and increase the contrast in processing. That give an
apparent increase in shadow detail at the expense of the highlights, not
any actual increase in film speed.
Of course if your film has say 3 stops of latitude you can simply move
the exposure down the curve by underexposing a stop or so which is the
usual process with C-41 and mini-lab machines. Many people incorrectly
call this pushing.
graywolf
http://www.graywolfphoto.com
http://webpages.charter.net/graywolf
"Idiot Proof" <==> "Expert Proof"
-----------------------------------
William Robb wrote:
----- Original Message ----- From: "Shel Belinkoff"
Subject: Re: Fuji Press 800 vs Fuji NPZ - was Which High Speed Film etc.
I seem to recall Bill Rob stating, more than once and often emphatically,
that you can't push, or that there's no benefit to pushing, color neg
film.
Perhaps someone can comment on this.
Yup. I said that.
C-41 is a develop to completion process.
There is nothing to gain by extending the development times.
Even the films that say they are pushable ( the old Press 800 for
example) would only give a bit more shadow seperation when development
was extended, but not an increase in speed.
William Robb
