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Posted by Stephen Campbell on November 30, 2002 11:29:42 UTC

You might be pushing the magnification a little
too high, try maybe 5mm eyepiece or 7mm.
I have wanted for a long time to build a scope which is optimised for planetary observing, here is what i would do,(taking cost into consideration
), make it a schmidt cassegrain, primary mirror the cellular type with a face/back plate with rib
structure, this has less thermal mass than solid mirrors and thus less distortion, alot of what people think is atmospheric effects is actually the mirror itself not being fully equilibrated to
the ambient air temperature, this is the reason all the new observatory scopes use lightweight cellular mirrors, not to mention the deformation
under there own weight, i would make this an f/20
,this will yield a large image diameter, and reduce dramatically the fine detail degrading brightness, but also reduce the field of view.

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