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I've heard a man (Billy Kelley) from Arizona who was into telescope making, near Lowell, and knew Bob Ballard (about wreck of the Titanic), (made 100 mirrors) and has passed away since: said that the limiting aperture for best viewing is 8". I guess it can be proven. And with larger sizes it allows in more light, but also the light will be more disturbed (from heat for example). So he said the Lowell Observatory has even stopped down their 24" Clark to like 8" for this reason. I guess it applies until you add adaptive optics or get it out into space.
David
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