Quote:
Originally Posted by thegableguy
Also - would have thought focal length was vastly more important for planets than aperture. They're plenty bright enough, they're just reeeeally small.
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You need aperture to resolve detail because of the wave nature of light (web search "diffraction limit" for more info). For visual 6-8" is pretty good. For imaging approx 8" is a minimum and up to about 16" will yield more detail. At ~16" and above atmospheric blurring and other hassles with a large mirror win out.
Re getting more focal length: that's why God gave us the Barlow.
