ProMaster HGX Prime Circular Polarizer Filter – 67mm – Frame thickness 7.4 mm – Lens thickness: 2.0 mm – Coatings: 18 layers – Light transmission rate: maximum 88.9% / average 44.4% (average at 400 – 700 nm) – Reflection: less than 0.6% (average at 420 – 680 nm) – Made in Japan