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Thanks for the replies and all the info. It makes more sense now. The risley prism thing explains the fix to the refraction I was worried about. And the empirical results are encouraging. I'll stop worrying now and go back to saving money for a CNVD.
I am the friend of the OP. I posed the original question to him. Thanks for your reply CoryT, but I don't believe you have addressed the core issue. (Perhaps you have and I just don't understand.) I realize that the day scope and CNVD do not have to be vertically aligned between their optical...