Made of high quality optical glass material and highdefinition grinding treatment, firm and durable. It can obtain more freedom to control the aperture and shutter, bringing more exposure means and creation space for photographic creation, and effectively preventing overexposure. Multilayer nanometer coating technology, with waterproof, oilproof, , scratchproof features. NDPL filters combine the best of both ND and CPL to extend exposure times and eliminate excess polarized light, fit for landscape photography. The color bias of the traditional ND mirror is avoided by the coating process, which can effectively solve the problem of color bias.