Sky-Mentor Light Pollution Filter 1.25" - SM-TA301-2

The Skymentor Light Pollution Filter is a specialty filter that blocks the visual spectrum except for wavelengths between 480 nm and 510 nm. This type of blocking filter is also known as a Nebular or ALP (anti-light pollution) or an LPR (Light Pollution Reduction) filter.

 This particular transmission characteristic allows passage of ionized oxygen and hydrogen lines, but blocks light pollution sky reflectance from mercury and sodium vapor lamps. 

NOTE & CAUTION: DO NOT USE for solar viewing!