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Thanks for your comments Andy and Lee. From what I have read, the ISO
sweet spot for most Canon DSLRs seems to be between 800 and 1000.
I am lowering my ISO as my tracking gets better. Now mostly using 1600. I know nothing about losing dynamic range at higher ISOs, but I
do know that images are much brighter, and more stars are visible, with
each ISO step up to 6400. {my camera's max} Beyond that figure I
wouldn't know. Obviously, the noise increases too.
I cannot see the haloes you mention, even at 400x{ when the pic is pixelated anyway}, but my eyes are not what they were. Assuming that they are there, maybe I've oversharpened a little. I'll have a look in DPP
at the unsharp mask setting. I use the ancient PS 7, so don't have the
features you mention. I don't use raw; too much stuffing around, and
humungous files. I don't use separate darks, flats, etc. I'm just
trying to produce the best results I can using basic methods.
raymo
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