This custom mount enables the use of any 52mm filter with our Moondog Labs Anamorphic Lenses for specific creative effects. For shooting video in bright outdoor settings, neutral density filters will slow down camera exposure times and eliminate motion artifacts (a.k.a. "stuttering"). A circular polarizer can be used to suppress reflections in order to enhance water and window shots - and other specialty filters can open up a world of organic creative effects. This item is currently on Backorder and won't ship until March 1, 2021.