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To be honest, having used a few different scopes recently, I have not found the SVX80 to be "Slow" and with it's native flattener it is supposed to cover a full frame sensor, with which I reckon it would give a larger field than my APS-C sensor with the reducer.
I did try it with my wifes full frame DSLR once and it seemed to cover the chip quite well without significant vignetting, but star shapes wise in the corners it was less than conclusive as it is an old Nikon D3, so the pixels are large and forgiving. If it was not such a hassle to set up I would love to give it a try with my astro mates APS-H QSI.
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