Lumicon Neutral Density Moon Filter ND13, ND25 and ND50 2'' Light transmission:13% Exploring the Solar System (2nd

Exploring the Solar System (2nd Edition) Peter Bond

Type  Refractor Type of build  Achromat  Aperture (mm)  70 Focal length (mm)  700 Aperture ratio (f/)  10 Resolving capacity  1

Specifically designed for binocular viewing

The improved precision polar scope maintains a fine engraved reticule

you bumped the mount

Lumicon Neutral Density Moon Filter ND13, ND25 and ND50 2'' Light transmission:13% Exploring the Solar System (2ndDescription Grey filter with 13%, 25% and 50% transmission. If you want to observe the moon with large aperture telescopes, you will usually need a relatively dark moon filter, so sufficient absorption is present with very large apertures. These filters are recommended starting from an aperture of 200mm, and especially with 250mm or above. Our expert comment: ND = Neutral Density % Lumicon filters use ND as a light transmission percentage. ND13 is