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Thanks Doug. This was taken with the 400D and I used ICNR for the light frames. I didn't realise at the time but ICNR wasn't applied to the flats, I guess because the exposures were too short. There seems to be a bit of grain in the sky background and I'm wondering if this is noise associated with the lack of dark subtraction in the flats? I combined 10 flats and 18x2min lights for this image so there were plenty of subs to average out the random noise.
I had to shrink and compress this image a lot to get below the 200 kb limit. I did a number of sets of flats and some with the light box rotated 90 degrees so hope to be able to check how even the illumination is.
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