The Hoya 46mm HD Protector Filter is a simple, clear filter with a 1x filter factor and is designed to provide general protection for your lens. This optically clear filter does not affect overall image quality while helping to prevent dust, scratches, moisture, and other substances from reaching or damaging your lens's front element. To prevent internal ghosting and reflections, eight layers of anti-reflection coatings are applied to each side. This total of 16 coatings offers a high degree of protection to the filter substrate and helps it to stay clean for longer than uncoated filters. Clear filter offers general protection for your lens. Does not require adjustments to exposure while in use. Eight-layers of multi-coating on each side to prevent internal ghosting and reflections. Multi-coatings promote effective cleaning with regard to water, oil, and stains. Creates no additional coloration or contrast. Thin, lightweight aluminum-alloy filter ring helps to prevent vignetting. Knurled front edges provide a more textured grip when mounting or removing it from a lens. 46mm front filter threads allow for use with other filters. Plastic case for storage and transport.