Fotasy 37mm Pro1-D (W) Super Slim Multi-Coated UV (Ultra Violet) Filter Ultra thin 1mm glass, Low Profile Frame, Ultra thin filter frames to help avoid vignetting on super wide angle lenses are also designed to hold 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. educed internal reflections mean a clearer image with greater contrast.