Quote:
Originally Posted by Paul Haese
I seriously doubt that any scope under an 18" would achieve such results on the planets (maybe Mars). Perhaps a 16" at 3/4 histogram on Jupiter. Saturn I was getting 34 frames per second in Red and Green but only 19fps in blue.
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Exposure time doesn't depend on aperture, but on f-ratio, and usually people want max resolution from given scope.
Very high framerate may be usable when doing luminescence imaging (with for example atmospheric dispersion corrector) - although limiting gain usually is better than super-short exposures at max gain. Here are some my Saturn examples (f/20 C11):
http://www.rkastrofoto.appspot.com/s..._gain_test.png