Circular polarizers from American Polarizers have a 50% transmission level

A circular polarizer filter with a 50% transmission level is available in standard sheet sizes from 8 × 10 to 18 × 24 in. In-house laser cutting and waterjet technology can fabricate custom shapes or laminate glass or acrylic with antireflection (AR), anti-glare, and conductive coatings. They are offered in neutral grey with right- or left-handed polarization.
American Polarizers
Reading, PA
www.apioptics.com