I was playing around last night. Everything was going great until around
midnight when I tried to image the Flame Nebula. Other than Alnitak causing
contrast and glare issues, I got a bunch of donuts in the image. They’re big
and dark as shown here:
http://www.mikemac.com/Astrophotos/NGC2024_Light_L_2019-01-25_00-06-57_Bin1x1_90s__-1C.png
Are those water spots from dew? I didn’t see any dew on the corrector plate on
my C6 SCT. Could they be on the image sensor its self? If so, how do I prevent
that from happening?
If they’re not water spots, what could they be?
Mike McDonald
mikemac@xxxxxxxxxxx
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