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It was guided - I am having some problems with guiding, hence the short subs. I'll try to work that out next. I've been getting double stars and elongated stars - I think I may have the balance too good.
The banding is also in the subs - so it is a capture issue of some sort, hopefully not a camera problem. The camera has a built in temperature gauge that was at -15C, but even without cooling I wouldn't expect this level of noise when it is only 8C.
I don't know why but also with my 550D I seem to get banding occasionally when I try to image fainter galaxies in sparse fields. I never get this banding with brighter objects in richer fields. I don't know why?
Also strange, in the past I have used ISO up to 6400 and I don't get this sort of noise/banding (if that's what it is). I'll see how I go next time - hopefully it will be okay.
Last week I imaged at ISO 1600 and didn't get banding, this time I dropped to 1000 - which should have less noise?
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