The Nikon 52mm C-PL1L Drop-in Circular Polarizing Filter dramatically reduces reflections from water and glass as well as rendering blue skies darker.Polarizing filters reduce glare from non-metallic surfaces such as glass and water, as well as darkening blue skies.These filters do not affect autofocus or auto exposure operation.Designed for use with telephoto lenses that feature a slip-in filter holder.Simply turn the rotating ring on the holder to find the most effective position.Drop-in circular polarizing filter fits the following Nikon lenses: AF-S 300/2.8D, AF-S 500/4D, AF-S 600/4D, AF-S 200-400/4G and the ED 400/2.8S.