conditions:very bright waxing moon last night, setting only late in the morning
location : light polluted Sydney suburb
target: IC 4268-the Prawn Nebula (surely you can see the prawn ?
)
Scope:ED 80
Camera:Canon 300D
Filter: astronomik 13 nm H alpha
Mount :CG5 autoguided
ISO:800
Exposure: 3 Hours and 40 minutes (10 minutes subs)-the longest I have gone to date on one target in one night
Processing: Deep Sky Stacker
yes, annoyed by the noise at two hours and ISO 1600,(see my Cats Paw nebula post if interested), I decided to go half the ISO and double the exposure. The night was very wet and I had the hair drier out every two to three images or so-in other words every 20 or thirty minutes.
This meant I had to find a new guide star about an hour into the session and the whole frame probably shifted a fair bit, but Deep Sky Stacker can handle this sort of stuff with aplomb. I absolutely love this software.
The moon was very bright and casting shadows and I needed no artificial light to look at my watch (used to time the sub frames, I still manually click every 10 minutes.Prefer this-I can check if I' ve lost a guide star
)
Anyway this is only a quick and dirty process of my data. One of these days I will add RGB if I can so I can colourise the image
your comments, suggestions are most welcome.Thanks for looking
Narayan
PS -a larger image image is available at my Flickr account
http://www.flickr.com/photo_zoom.gne...7678826&size=o