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The larger a scope's aperture, the more it is affected by poor seeing.
On nights of good seeing or better, your 20" will blow your 14" into the weeds,
but on fair to average nights you won't see much difference [on the
planets]. You could make up a matt black cardboard aperture stop, say 16" and
see if it helps on nights of poor seeing.
raymo
Last edited by raymo; 25-07-2017 at 12:41 PM.
Reason: more text
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