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The camera itself wont vignet. There is more than enough clearance for the light to get thru. What needs to be looked at is the path, and most important, the image circle produced by the optics.
Anyways, vigneting doesnt elognate stars. It only reduces the contrast as apposed to the centre of the image.
Elognating stars at the ends of the field is a good old case of coma.
Theo.
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