Hoya SMC (Super MultiCoating) is applied to both front and rear glass surfaces to increase light transmission and prevent flare or ghosting. The coating is further protected with a clear water and stain resistant surface to allow easy care and handling of REVO filters in the field.
Nice and thin filter to fit on the two Samyang lens I have 12mm f2 and the 50mm f1.2 no filter need for 8mm f2.8 fisheye I also order the 21mm/35mm all these lens for the EOS-M