Heliopan 37mm UV Glass Filter, SH-PMC (16 Layer Super Hard Multi-Coated) SH-PMC is Heliopan&apos;s 16 layer multi-coating for their filters. Haze filters proide additional benefits of correction for Ultraviolet(UV) light which can register Ultraviolet filters allow you to correct for the UV effect to varying degrees. The UV-Haze filter is helpful when photographing mountain and marine scenes&#44; where increased Heliopan filters are dyed in the mass and ground&#44; polished and coated to the highest standards