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How much vignetting is normal?
Very recent telescope purchase, haven't really had the weather to play with it outside so I thought I'd do SOME testing with flat fields.
Currently using a QHY9 (KAF8300) on a 0.8x flattener, spacing should theoretically be within 0.5mm of correct from what I have been told, seems to pass the ruler test.
Added is my flat field test run through CCD Inspector. The flattener has a corrected field of an APS sensor (36x24) so I was expecting less vignetting with a KAF8300. Is this just me expecting more than what I should or do I possibly have to go and revisit the spacing calculations?
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