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Thanks for your contribution Kevin; you're spot on with the more subs comment, and I can say that I have taken two 30sec 6400 subs, and
four 30 sec ones, and couldn't see the slightest difference; even the noise looked pretty much the same. I can see differences in star densities in
the four corners of the image, but can't see any vignetting. It would
surprise me if I could, because the image is heavily cropped. Perhaps my
eyes are even worse than I thought. Incidentally, my 80mm achro
suffers badly with vignetting.
raymo
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