Quote:
Originally Posted by sjastro
Thanks,
I wonder if a new flat will record that artifact in the image.
Steven
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I have worked out what the linear artifact is in my image. It is not the flat.
I had forgotten that to the north of my observatory is the power lines running to my house. They are reasonably low but so was this PN. They normally don't bother me but I must have imaged through the wire and with the big stretch in the image they caused the artifact.