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Hi Albert, Welcome to IIS! a nice collection of images there!!! Very sharp and colorful!!
Looks like you have some vignetting there for the canon ccd sensor to deal with. You have done a excellent job with removing the gradients. Is it possible to alter your ASA astrograph to fix this? A larger secondary? I guess a f/2.75 would have a very large secondary already..
My grandparents are from your way many years ago!
Cheers and hope you get some clear skies..
Gary
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