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Hi Doug,
Great first effort.
I take it the 30 second subs are because you did this unguided?
First order of business would be to setup an autoguiding solution so you can get longer subs.
10 minutes is a good length for that chip. Too long and the small well depth mean too much bleed on bright stars. Too short and you won't get enough signal to get past noise. I'd say 10 minutes on most objects and perhaps 4 or 5 minutes on bright globs.
I get no banding at all on my 8300 chip. In fact the darks are quite flawless. Maybe something to take up with the camera manufacturer.
Greg.
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