Re: [APML] "pushed one stop" meaning

[Grant <GB1029@inter-linc.net>]

Marios,

Hello.  "pushed one stop" is simply processing the film longer to bring
out fainter detail & (I believe) increases contrast.  Example: 200 spd film 
pushed one stop gives
you the equivalent of 400 spd film. two stops.. 800 spd film.. and so on.
The disadvantage is the film grain becomes more apparent.  Because the 
"pushing" takes place
at the photo lab, you should decide ahead of time (before taking any 
exposures) how much you plan to have the
film "pushed". Also, push processing is only beneficial with some 
film.  E200 responds
well to push processing.  It can handle up to a 3 stop "push". So, if a 30 
min exp with normal processing hits the sky
fog limit just perfect, you should be able to obtain similar results 
exposing for only 15 mins with a 1 stop push.
Hope that helps!

Grant


At 09:13 AM 8/27/01 +0300, you wrote:
>Hi all,
>
>I'd like to know what "pushed one stop" or "pushed two stops" means?
>
>Thanx.
>Marios.
><http://www.cyprusastronomy.com>http://www.cyprusastronomy.com


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>