forgot to add the Lumicon filter guide link. Ta for the PM Allan-L:
http://www.lumicon.com/store/pg/15-L...a-Filters.aspx
Neutral Density filters work. I prefer to use a pair of polarising filters as I can then vary the transmission to suit me. A single polarising filter sometimes is fine on its own. I find a pair of these more versatile. Again, I don't use them often except for extended low mag viewing of the moon. As my main lunar and planetary scope is a C8, at high power I find I don't need to tone down the glare. But colour filters help with some details with the planets.