... (Neutral Density) filter Material:Made of optical glass Sizes :37 49 52 55 58 62 67 72 77(mm) Models:ND2, ... ND4,ND8,ND16,ND32 Optical ND(Neutral Density) filter 1.This products is used to ... 72 77(mm) are all available.3.Models:ND2,ND4,ND8,ND16,ND32 are all vailable.4.We ... owns our owned factory,and specialising in producing ND filter many years,So,donot worry about the quality,and ...