Hoya Protector HD Series 77

The Hoya HD clear glass protection filter is a wise initial investment. It helps protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs. This unique filter has been designed to be extra strong against both breakage and water damage - a big benefit when it comes to protecting your expensive optics. It can repel water and is also stain resistant which will permit more light to reach your sensorfilm. Ultra clear high transparency optical glass  8-layer multi-coated to minimize reflection at the filter surfaces which reduces flare and ghosting. If desired it can be left on the lens at all times for protection Water & oil repellent, scratch & stain resistant  4x the breaking strength in ANSI standardized testing - rated against steel balls of varying size and weight dropped from a height of 50" onto the glass Wide-angle lens compatible thanks to ultra thin frame