Re: [APML] Speeding up film with cold weather

["Clayton Kessler" <ckessler@gatecom.com>]

Alan,

I have not done any formal experiments but I have noticed a difference in
winter pictures as opposed to summer pictures.  I seem to get more negative
density for my typical 1 hour exposure in the winter.  There may be other
factors than the temperature involved but I "feel" that the cold is a big
help.

Clay Kessler

----- Original Message -----
From: "Alan Voetsch" <critter12952@yahoo.com>
To: "APML" <astro-photo@seds.org>
Sent: Saturday, November 02, 2002 9:35 PM
Subject: [APML] Speeding up film with cold weather


> Hi all,
>
> I know this is not a new concept (cold cameras). I
> remember reading in Splendors Of The Universe that
> film speed effectivly doubles when the temperature
> drops below freezing. I have never really noticed
> this, but am working on new pictures that I can
> compare to pictures I took last month when the weather
> was warmer.
>
> I would like to hear if any of you have ever checked
> this out and done comparisons for yourself. Is this a
> real or imagined effect?
>
> Thanks,
> Alan
>
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