Three ND filters 0.3 / 50%, 0.6 / 25% and 0.9 / 13% and a Moon & Sky Glow filter allow you to choose the perfect filter for your viewing conditions. The Sky Glow filter provides a high contrast view of the lunar surface and improves observation of deep sky objects in light polluted skies. Includes case and moon map. The Moon & Sky Glow Filter selectively reduces light transmission at different wavelengths and greatly improves contrast for observing the moon. This filter gives the moon a very bright purple color. In light polluted skies, the Moon & Sky Glow Filter provides some contrast enhancement when viewing deep sky objects, as the filter blocks some wavelengths associated with common forms of light pollution, such as low pressure sodium street lamps.