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As a general rule of thumb high quality optics in the 6 to 10" range that are well cooled and collimated should stand a maximum of 50 X per inch of aperture ( ie 5mm on a c8 ) but high contrast objects such as the Moon and Saturn are the usual contenders for that sort of magnification.
That being said if the conditions are that good then 25X per inch will also extract all that can be seen as the diffraction structure in the image ( ie the Airy Disc ) will become visible that power to the trained eye and beyond that is a bit like magnifying news print .
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