Quote:
Originally Posted by MuntiNZ
Yeah but your comparing a 10 incher to a 12 incher.
The bigger one will usually be better even if the big one has optics not as good as the smaller one.
Apature rules mate.
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Larger apertures only ( for example) show fainter stars only if the light is properly focussed in to the Airy disc. Theory shows, that at a wavefront error ( primary spherical ) of 2/3 of a wave / 1/3 surface accuracy , a superb telescope of _half_ the aperture will have the same visual magnitude limit.
Bright diffuse objects will benefit from extra aperture even't if it isn't quality, but the higher contrast of a smaller more accurate system will really help in spotting faint galaxies.