I'd just like to add that, at least at a technical level, there is no new detail to be seen above magnification of 25X to 50X per inch of aperture as , depending on your eyesight , at these mags the ( stellar ) diffraction pattern is allready visible.
Its a bit like magnifying newsprint: once you see the dots you are not achieving anything ( extra ) . The Moon, being a very high contrast object, can stand magnification way beyond the 'practical' level as it has a high "wow" factor zooming into a crater, and is very bright.
For planetary observing it is best to keep the powers lower as there can be many features visible through color differentiation rather than resolution. Witha 1mm exit pupil the eye has very poor colour perception.
Saturn also, generally showing little disc detail, seems to stand very high powers as well. I think its yellow monochromatism also helps with problems of chromatic atmospheric dispersion, holding a slightly sharper image at high power, much as the red channel on the RGB data of the planetary imagers is always sharper.
Mark ( The party pooper
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