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Well... a Newtonian of the same focal ratio will beat all of the foregoing - provided you can reach the eyepiece LOL...
Which brings us back full circle to a long f/ratio cassegrain - say f/15 to f/23, which has a small secondary, and puts the eyepiece in a sensible location.
Unlike commercial SCT's, which seem to be the worst of both worlds - a focal ratio too slow to be useful for imaging, vs a focal ratio too short - and a whopping fat secondary too big - no good for lunar & planetary use.
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