I have the Williams Optics Megrez 102 F/7 ED. I find for planetary viewing its pretty good, but it does not compare to my 11" SCT.. It shows a very sharp, contrasty and detailed view at 160x magnification, I find it to be great, but it does not resolve the same detail on jupiter that the C11 does.
For planetary viewing, you do need a bit of aperture.. I'd look towards a well corrected long focus 6" Achromatic refractor, or a decent sized newtonian as the cheapest option for great planetary viewing.
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