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I think I know where your coming from Paul, your imagining that if you had a wall that had a 5cm hole and a 50cm hole and if you stood the same distance away (ie same focal length) then you would certainly see more through the 50cm hole. The problem is how that hole translates to the optical train. My guess is that you see the hole as the aperture of the telescope, when in reality the hole is the field stop diameter of the eyepiece. Of course I might be wrong about your thought processes, but I hope this helps anyway
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