A useful filter for spotting scopes that reduces brightness and improves contrast and resolution when viewing the Moon.

This simple Moon filter fits easily into the eye-cup of virtually all spotting scopes. It's at it's most effective when used with scopes over 65mm aperture, were the sheer brightness of the Lunar image can actually reduce the appreciation of detail by dazzling the observer and lead to a lower contrast washed-out image. Supplied in moisture-proof plastic storage case.