SVBONY moon filter is a good all rounder filter suited to many applications;including the observation of the moon and planets;a broad spectrum of light transmission means it does not block as much as a deep sky filter The filter has a mild effect of darkening the background of the night sky so that the fainter objects are more clearly seen contrasted against the blackness of space Effectively filters out selective wavelengths of low pressure sodium and other man made sources typically used in street lighting;give improved definition of the surface of the moon High quality metal construction;it is mounted in a nicely anodized housing and is threaded on both sides for stacking with other filters if necessary Standard filter thread for any 2” telescope eyepiece and other accessory;comes with a plastic box to keep it safe and clean when not in use