Re: [OM] Astrophotography

[Chuck Norcutt]

I have no idea how to find it now but I used to have a reference table 
(from the web somewhere) where you could determine the maximum exposure 
time for a motion free image given focal length and magnification.
Chuck Norcutt


On 7/28/2014 8:10 PM, Paul Braun wrote:
> You still need the equatorial to keep the target stars in frame, or keep 
> repositioning.  Depends on length of exposure. DSS adds all the light frames 
> together, subtracts the noise from the dark frames.  Makes stars that are 
> really dim visible.
>
>
> Paul Braun
> Certified Music Junkie
>
> "It's such a fine line between stupid, and clever." -- David St. Hubbins
>
> "Music washes from the soul the dust of everyday life" - Berthold Auerbach
>
> > On Jul 28, 2014, at 18:50, Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx> 
> > wrote:
> >
> > Snip  .......using Deep Sky Stacker and shooting anywhere from
> > > 200-300 frames at a time.
> > Why so many frames?  So  DSS  obviates the need for an equitorial tracking 
> > mount?  What does it do with the exposure?
> > Sounds very cool.
> >
> > Star Struck Mike
> > --
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