Fotasy UV49 49mm Pro1-D Super Slim Multi-Coated HD UV Filter (Black) Ultra thin 1mm glass, Low Profile Frame, Ultra thin filter frames to help avoid vignetting on super wide angle lenses Pro Multi-Coated, this filter can greatly reduce the appearance of lens flare and ghosting caused by reflections. Knurling Edge Frame. The filters is equipped with a straight knurling edge for non-slip, easy attachment and removal. Absorbs ultraviolet rays which often makes outdoor photographer hazy and indistinct, it also serves as a permanent lens protector. Reduced internal reflections mean a clearer image with greater contrast. Black matte aluminum satin finish almite frame reduces reflection.