Lumicon Neutral Density Moon Filter ND13, ND25 and ND50 2''

Description

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.

Lumicon filters use ND as a light transmission percentage. ND13 is hence equivalent to a 13% light transmission, ND25 to a 25% light transmission and ND50 to a 50% light transmission. So, for example, an ND25 filter allows more light to pass through than an ND13.

Specifications