Quote:
Originally Posted by omegacrux
But what if a 150x750mm and a 150x1000mm were both at 100mag wouldn't one be fast and the other be slow ? or both be the same . my head is about to go bang
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A 6 inch telescope at the same magnification will give the same brightness view regardless of the focal ratio of the mirror. It's only the eyepiece that must be different to produce the same magnification in each scope.