It is possible to get really good detail with a small telescope and small pixels, just very difficult to do due to the very small light grasp. A 4" telescope under excellent seeing will out perform a 16" under average seeing BUT a 16" under excellent seeing will out perform a 4" under the same conditions. Under all but the best conditions a 6" telescope resolution wise will forever be limited by seeing conditions.
An 8" has the best resolution that can be achieved on the Earths surface.
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