Reduces glare for the observation of the moon for a more comfortable viewing and to increase the ability to catch faint details
Reduces glare from sodium street lights to help cut through the light pollution for improved views (visual and photographic)
Mild darkening of the sky background for enhanced contrast
A broad spectrum of light transmission means it does not block as much as a DeepSky filter such as UHC, OIII or CLS but is a good allrounder filter suited to many applications, including the observation of the moon and planets (DeepSky filters are not designed for this).
Filter itself is threaded to enable stacking additional filters if required