[janoskiss (Steve H)]

For public viewing nights a brightness reducing filter is useful. Crossed polarisers are good but an ND filter is easier to work with. ND's are also more readily available in 2" format.

It's worth noting that the surface brightness of the Moon's image and the amount of Moonlight hitting the retina per unit area depends only on the exit pupil and not on the aperture of the scope. Of course, for a given exit pupil, a bigger scope will yield a larger image. A 28" is big enough to just about fill one's field of view with the face of the Moon at the full brightness of 7mm exit pupil.

Some folks get alarmed about eye damage when looking at the Moon through a large telescope. But this can never happen. Even at max, ~7mm, exit pupil, Moonlight through any scope is not as bright as clear sky in daylight. It's just the contrast between the Moon and the darkness of night that gets you. For serious Moon observing you can pick up more detail without a filter. Downside of course is that you won't be able to observe much else for several minutes afterwards.