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Any ideas on this artifact?
Hi all, I shot a sequence of 12 frames of M78 last night & this gradient showed up after pre processing. It's in every frame. I've deliberately over stretched the image to make it obvious.
The night before I shot the same sequence, same setup, same target & no artifacts were present. Details are:
12 x 600sec frames, bias & darks subtracted
Scope - William Optics FLT98
Focal reducer/flattener - William optics AFR IV
Camera - SBIG 8300C
Filter - Baader IR UV
Any ideas what has caused it?
Thanks in advance,
Tony
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