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Thanks Allan, information appreciated, but I would still like to know
how much more sensitive a CCCD camera is than a DSLR-3x-10x-20x?
I understand that I can't take very long exposures, but some of the exposures listed in the book are quite short, only a minute or two, so maybe I could have a try at some of those targets with my DSLR. I am
finding that I can use ISO 3200; Neatimage is miraculous at removing
noise.
raymo
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