Re: [APML] Pushing Film

["Keith Geary" <keithg1@eircom.net>]

Thanks Kevin, i'll definitely be wary of 1 hour labs in future!!!!!
Keith....

----- Original Message -----
From: "Kevin Wigell" <kwemail@twcny.rr.com>
To: "APML" <astro-photo@seds.org>
Sent: Monday, July 28, 2003 8:50 PM
Subject: [APML] Pushing Film


> Keith wrote:
>
> <<Hello all, please excuse my ignorance, but i'm new to this group, i've
been
> doing astrophotography for 1 year now -
> if i am taking a shot on the 'B' setting how can you push the film 'one
> stop' - is this the rating you set manually on dial of the
> camera itself?
> For example, if i'm using an ISO 200 Film, can i 'push' it to ISO 400
using
> the dial - or am i wrong?>>
>
> Keith, when we talk about "pushing" film, it refers to the development
process. It has nothing to do with your camera settings. Some films (E200
for example) can be "pushed" by leaving them in the developer longer than
the normal time specified by the film manufacturer. Usually when this is the
case, the film manufacturer will specify some specific times in the
developer for pushing 1, 2, or even more stops. If you have your film
developed by a professional lab, you can tell them "push 1" or "push 2" and
they will do this for you (usually for an extra fee). At one-hour labs, if
you give them these same instructions, they will either look at you funny or
call the police, or both.
>
> Pushing film will increase its sensitivity, and also its grain or noise.
>
> Kevin Wigell
> www.kwastronomy.com
>
>
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>


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