Quote:
Originally Posted by Atmos
Yep, you're correct about squaring the telescope efficiency, should be EF(A^2).
I usually put the "206.265" in there mostly because I am curious about sample size, interested in doing photometric studies. As you say, it isn't needed outside of that.
No source, came up with it on the drive home from work a month or two ago when I was trying to decide on a camera :-)
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thanks for that. It seems surprising that such a basic idea does not appear to be very widely quoted - I also derived from first principles, but then could find only one reference to anything similar on the web (and that by happenstance). Maybe it is just so obvious that nobody bothers to formalise it, or maybe I wasn't looking in the right places.