High Quality Didymium Optical Glass. Nano Multicoated. 16 coats, 8 each side. No Color cast
Easy Clean. Water Resistant.
Blocks out skyglow without changing the entire color spectrum
Rotating Front Ring to Vary Polarizing Effect.1 Stop Exposure Correction. 1 f Stop Filter Factor..Superfine matte black frame. Double threaded metal frame for additional filters or Hood..Includes Storage Case.