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Hi Colin,
Well, you are the astronomer! But, so is the guy giving the Dragonfly lecture in my first post. So, those are his formulas about effective aperture and fratio. If I understand your post you seem to be saying that only the fratio changes. But using multiple lenses changes the total area of light gathering, doesn't it?
Yes, I'm over thinking this but I'm writing an article about my 2 scope system and trying to come up with some supporting math to justify my determination that imaging with two cameras at one time has some real benefit. It's obvious that I'm imaging 2x as fast. Is it not reasonable to equate this to a hypothetical single camera system that would give the same performance?
Peter
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