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That's a good image regardless of noise floor. I find the same pattern noise (the banding which I assume is an artefact of the backside illuminated sensors) drops away easily with even a short exposure. 2 hours is amazing and shows how high the QE is.
To get a CCD image that good is going to take more than 30 minutes each of LRGB I would think.
I did some flats last night and they showed none of that fixed pattern noise.
I first noticed that banding shifting on some ASI6200 darks shown on a thread in the equipment section. I compared them to my FLI Microline 16 darks and they don't show that at all. So its a CMOS thing at this stage and perhaps a backside illuminated thing.
I think its something you could live with though as it should disappear with a decent exposure. Also dithering is probably important for this.
Greg.
ps. totally jealous of the 130 GTX. I would love one of those. Like an FSQ130.
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