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other factors doug might like to consider..
getting lenses to fit CCD cameras can be quite an effort.. i had QHY9 camera and filter wheel connectors modified to reduce the distance between lens and sensor, then bought a Mamiya 80mm medium format lens and had adaptors made up for that. all adds to cost and tediousness compared to snapping on a canon lens made to work with a DSLR.
i've also not been 100% happy with the halos/colour fringing that i think results from the microlenses on the pixel sites. this has a big effect on DSLR widefield images but if anything it's worse with the QHY9. as always, it's a work in progress and more testing required..
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