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Chaps, The second image is what I though should have been a dark. It was fairly stretched though.
I am currently taking more darks as suggested. Inside a dark-bag.
Bert's explanation for the flat holds water for me, as I had tried earlier to set up my FS-128 with a reducer operating around F5, and basically gave up due to the severe apparent vignetting and the exacerbated dark line across the bottom of the image. I had hoped my move to the FSQ106 would have solved these issues.
It has been difficult to pin things down, as there has been so few evenings when imaging has been possible, mixed with a fair amount of travel for me. Its only been these past few nights when I have been able to get back into the shack.
I will post the results of my 'new' set of darks in a little while.
Thanks for your interest.
Brian
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