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Funny that no one mentions magnification.
If you use a 127mm aperture scope at 60x to look at deep sky objects and then point it at the Moon, of course it will look too bright because that is a very low magnification for lunar or planetary viewing. At that magnification you will not reach the resolution the scope can offer - so why even bother looking. Now if you bump up the magnification to 120x, then the Moon will look 4 times dimmer, or the equivalent of using a strong ND filter. And you can push the magnification even higher if the seeing permits. No need to waste photons with ND filters.
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