Hello,
Imaged The Horsehead and The Flame Nebula this morning and after processing I noticed what looks like a reflection of the optical tube just to the top left of the bright star Alnitak. My question is- Is this common with a bright star that is not in the middle of the frame or was there something wrong with my setup like collimation???
I thought I had my collimation spot on (I use a laser collimator prior to each imaging session). Of course I should be able to clone it out of the image but I ideally don't want to do that if It can be avoided at the imaging stage. Any thoughts on what is the cause and how to avoid it???
Telescope used is a 10" F/4 Newtonian running on a NEQ6 Pro Mount, with guiding done with a Synguider through an 80mm ShortTube Guidescope. 12 X 5min exposures @ 800ISO with a unmoddified Canon EOS 1000D. Dark Frames (10 X 5min) subtracted.
Cheers
Greg
