Lumicon Neutral Density Moon Filter ND13, ND25 and ND50 2'' Light transmission:13% Specifically designed for binocular viewing

Specifically designed for binocular viewing

gear wheel for easy installation onto the tracking shaft

Multifunctional wide angle eyepieces

TS-PHOTON 203/800mm Advanced Newtonian for astrophotography and observing

The improved precision polar scope maintains a fine engraved reticule

Lumicon Neutral Density Moon Filter ND13, ND25 and ND50 2'' Light transmission:13% Specifically designed for binocular viewingDescription 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