-Allan Keller
Ray Gralak wrote:
> I dragged out my SBIG AO-7 and put it on the back of my 5" refractor
> after an Astro-Physics 2x barlow. Later I would determine from images that
> the focal length is 2641 mm or f/20.84!
>
> I was out to create a better M27 than I had a few nights before. I
> used the RGB data from that night which was taken at f/16 and 2x2 binned
> (effectively f/8 scale) and combined it with 90 minutes of AO-7 data
> collected last night from my backyard. I actually tried to expose about
> twice that much data but for some reason Maxim was not reacquiring the
> guide star *sometimes* between exposures (actually, half the time). I'm
> sure this must be from something I don't have set up right.
>
> I feel this is the absolute best image of M27 I can do from my backyard
> with my 5-inch refractor. For those who try something like this I warn
> you again that this technique will only work well on bright objects!
>
> http://www.gralak.com/Astro/M27-LRGB-FS128-AO7.jpg
>
> Take care,
>
> -Ray Gralak
>
