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Oh I don't have any problems with the sums, RAJAH and Ron. I can work them out np. Its just that the sums don't seem reasonable to me. And I accept that eyepiece design has a lot to do with it, but it just seems "natural" to me that the bigger the hole I'm looking through the wider the my field of view will be. Maybe someone artistic here can draw a diagram that will explain it to me.
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