Sky Mentor Light Pollution Filter - 2" - TA-301-3 2X Barlows Distance from Rubber Cup: 15

Distance from Rubber Cup: 15 mm

an older child

Explore Scientific U-Mount with Tripod for Large Binoculars

Package Includes: Enlarged focuser with 3" entrance aperture and 2

Cassini''s Division in the rings of Saturn

Sky Mentor Light Pollution Filter - 2" - TA-301-3 2X Barlows Distance from Rubber Cup: 15Sky Mentor Light Pollution Filter 2" The Sky Mentor Light Pollution Filter is a 2" 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