A Circular Polarizer is the must have filter for every photographer and Hoya's NXT Plus is a powerful upgrade to the best-selling NXT series. The new filter employs a waterproof top-coat to Hoya's polished smooth "Clear" glass for easy cleaning. Dirt, smudges and water wipe away easily. Using 10 layers of Hoya's patented anti-reflection (AR) multi-coatings your images show improved contrast, color and sharpness. The polarizing film is optical thin with a filter factor of 1.72 for faster AF and improved viewing over standard PL films. Hoya's high quality polarized glass is mounted into a precision milled aluminum slim frame, making it lightweight and perfect for your wide-angle lenses. Despite the slim profile the filter includes front filter threads so you can attach additional filters or your protective lens cap. Waterproof Top-coat for easier cleaning Polished Hoya Clear Glass 10-layers of HMC Multi-Coatings 1.72 filter factor Low-profile Aluminum Frame