Quote:
Originally Posted by gregbradley
That's actually a nice image Peter. I don't see any troublesome blue halos here so it looks like you are pretty much on top of that.
Yes longer total exposures is the way to go. Even with my 17 inch 8 hours total is a bit on the light side. 12 hours is a good target. Judging from many of the images here and Rob Gendlers original works 12-30 hours is good depending on the aperture and dark skies, camera sensitivity etc.
I thought the strategy with CCDs was shorter exposures with light pollution ( the sky glow builds up faster than the signal) and longer with dark skies.. Also with the Trius short exposures are a good solution to the haloing effect anyway as Ray's images show.
Greg.
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Thanks Greg!
I guess I will need to try imaging over more nights. With the weather so erratic and my inability to see very much to the East I'm limited to picking targets that are overhead pretty much. As the evening progresses I then get gradually worse and worse LP as I track to the West. If I get 3 r 4 nights in a week or two I'm inclined to start processing! I will need to become more patient! I'm around 10 hours total if I include RGB time so perhaps not too far off, but as Ray points out the number of subs required starts to increase dramatically if I want to do better.
By the way, how do you deal with a large number of subs, say luminance with something like 40 subs? Would you stack them all in one go? And, do you ever combine differing sub exposures? I did in this case and just let CCDStack put in a weighting factor.