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Thanks guys. Wavy, that's the sort of info I was after. Excellent. Guess I should have posted a little more info in my OP.
The ED80 I have is 600mm, the ED100 is 900mm. What I might do is look at the detailed numbers for each scope, then try to find a mix that will suit both on average (for now).
So from what I gather in your post, I'd be looking at max mags of 160x for the ED80, meaning a 3.75mm eyepiece (I'll round off later, just doing the maths now), and 200x for the ED100, meaning a 4.5mm eyepiece.
You lost me a bit with "at the other extreme" and "exit pupil your eye can accommodate", but if I work on 5mm like you, ED80 gives me 16x and 37.5mm, while the ED100 gives 20x and hence 45mm.
So now I might do a bit of a search around for eyepieces in the, say, 5mm to 35mm range. I'll probably be looking at the ED pieces as a min.
Does that sound like I'm "getting it"?
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