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If you are after a constant sharpness in your image and that is your criteria then stop your scope down until you see a stable airy disc at high power. for most nights it will probably be 6" aperture or less .
That being said I always see more with a larger aperture regardless of the seeing or sky brightness.
Fleeting moments always show more detail than that which is constant in a smaller aperture IMHO.
Also I believe that instruments with larger central obstructions show less in inclement seeing than more modestly obstructed ones.
Does anyone have similar experience ?
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