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Just to clarify, Les, let's take the example of an EP-telescope combination which produces an exit pupil of 8mm, the scope has an aperture of 20 inches, and a sample observer has a 6mm iris dilation.
By my reckoning, the area of a 6mm light path is about 56% of an 8mm lightpath. Are you saying that 44% of the light gathered by the scope is effectively lost, such that the scope's effective aperture in this instance is being reduced by the same factor? (In this case, by my calculations, the 20 inch mirror is effectively reduced to a 15 inch mirror).
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