Re: [APML] Speeding up film with cold weather

[Alan Voetsch <critter12952@yahoo.com>]

--- Jerry Lodriguss <jml@astropix.com> wrote:
> If you are going 330 minutes at f/10, then it sounds
> like the film does 
> have reciprocity failure, otherwise you would be
> overexposed at that exposure.

Hi Jerry,

Most likely I don't know what R.F. is. :-)

I figure it refers to a films lack of ability to
continue to record photons at a constant rate. Please
feel free to educate me if needed, I bow to your
expertise. :-)

 My results so far show that Supra recorded well over
twice as much light in a 330 minute exposure as it did
in a 140 minute exposure. This film is a slow, but
steady collector of light.

That really surprised me, as I assumed 150-180 minutes
would be my upper limit. I can occaisonally see 5.6
magnitude stars here, but I'm 50 years old. I'd guess
6.0+ would not be out of the question for younger
eyes.

Alan

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