Help!!!....
I have been battling with this artifact that I'm getting on some images..On Saturday night the viewing was reasonable good so I ventured out in an attempt to capture the Helix...These single images are both 10min exposure at 800 asa, yet one has a distinct line in the bottom of the image...this is consistant .... it's always the same in the frame that is affected by the artifact.... There is what appears to be amp glow in the top left... but this artifact has me stumped... The camera is an unmodded 450D..I have it in prime focus on my Skywatcher reflector.
Hoping someone may have had a similar problem that they may have a solution for...
Regards
Paul
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