Re: [APML] "pushed one stop" meaning

["Marios" <marios@net-sea.com>]

Grant,

Thanx for the info...it helped! :o)
I thought that you push the film on the camera. For example if you put a
400ISO film, instead of turning the ISO to 400 on the camera you turn it to
800ISO or 400x2.

Marios.
http://www.cyprusastronomy.com

----- Original Message -----
From: "Grant" <GB1029@inter-linc.net>
To: <astro-photo@seds.org>
Sent: Monday, August 27, 2001 10:43 AM
Subject: Re: [APML] "pushed one stop" meaning


> 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
>
>
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