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Re: [APML] Exposure Times
Hi Steve, I'll second (or is it third <g>) Bert and Tony's exposure recommendations. I've never had the chance to shoot 400F from a sky any better than about mag 5.5, and even then, I have gone to 2.5 hours @ f/11 without fogging.
John Boudreau
http://home.comcast.net/~jeboud/astro.htm
----- Original Message -----
From: "Steve Lindsey" <stevelindsey@earthlink.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, October 25, 2003 2:32 AM
Subject: Re: [APML] Exposure Times
> Thanks Bert & Tony. I should have dark skies and I doubt I can go too long.
> Someone mentioned a while back that they thought the Provia pooped out after
> about 60 to 90 min but I'm thinking 120 sounds right. Interested in your
> results.
>
> Steve
>
>
>
> > Steve,
> >
> > I went 2 hours on Provia 400F on ngc7331 on a 11" sct at f/11.5. Good
> tracking, good focus, but Not enough exposure. My 'scope is now on ngc7331
> and I am trying going to go for 3 to 4 hours. I love the image size at
> f/11.5, but the time gets awful long...
> >
> > I will let you know if I picked up any image density going from 2 hours to
> 3 or 4.
> >
> > Tony P.
> > Kopernik Observatory
> > Vestal NY
> > www.darkstarimages.com
> >
> >
> >
> >
> >
> > Steve Lindsey <stevelindsey@earthlink.net> wrote :
> >
> > > Hi folks! Been a while since I've been making much progress.
> > >
> > > I'm going out tomorrow night and barring wind will probably try these on
> > > Provia 400F. What exposure times do you recommend at f11 on my 10" SCT?
> > >
> > > Helix Neb
> > > Cone Neb
> > > M1
> > >
> > > I'm thinking going pretty long at f11.
> > >
> > > Steve
> > >
> > >
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> >
> >
> >
> >
> >
> >
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>
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