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I've tried to be more specific. Maybe what I'm asking is not clear, perhaps the answer is obvious, either way I'm using Canon lenses - no plans for a scope. Yep, I'm imaging with a finder scope and want to attach an expensive CCD to it. Is anyone else using camera lenses?
Thanks Doug, the binning issue is not something I understand as far as OSC's are concerned. I'm working on the assumption, pretty much, that there's not a lot of difference between 5.6 and 7.4um, except that the KAI 4020 is 7.4 has a great reputation, even at 4.2mp.
I'm not sure which way to go - the bigger pixel or more pixels, I think it's coming down to that, as a compromise across the two focal lengths. I'm not sure I have a complete grasp on the science yet to make an informed decision. It's not like I'm selecting football team.
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