Quote:
Originally Posted by avandonk
The elongation in the top right corner is due to a mixture of vignetting field curvature and slight error in the collimation. Full frame is very difficult to get everything perfect to the corners especially with fast Newtonians.
Bert
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Hi Bert
I was referring to the centre of the image.
With my f/5 Newtonian 1520mm focal length I use a Coma corrector which I find works a treat with outer field coma distortion.