Re: [APML] Exposure Question

[Alan Voetsch <critter12952@yahoo.com>]

Hey Brian,

--- Brian Larmay <astrobri@ameritech.net> wrote:
> Ive been slipping on everything concerning astrophoto since spring
> and will
> finally be getting out tonight for some long overdue practice.

I know, for many reasons 'practice' has been hard to come by this year.

> My question is concerning exposure time...I always stop my lens to
> f/4 with
> exposure times of 7 mins, but this time I want to stop down to f/5.6

I believe this would effectively double your time. Going to f/8 would
be another doubling.

I'll let others more qualified answer the rest of your questions as I
would mostly be opinionating. :-)

Alan




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