Compatible with filters 100mm wide and 2mm thick, the NiSi Switch 100 Filter Holder enables you to utlilise two filters simultaneously, and allows the dual slots to smoothly rotate together or independently. The independent rotation is ideal for photographers who wish to combine graduated ND filters positioned at different angles. A smooth 360° rotation means you can arrive at the precise angle of the graduated ND filter necessary or desired. Meanwhile, the rear holder can be secured in position via a locking screw. The filter holder causes no vignetting at 16mm on a full frame and is suitable for a wide variety of lighting situations. Of note, the Nisi Switch requires the NiSi 82mm adaptor ring for the 100mm system for mounting to a lens. This 82mm adaptor is included in the NiSi V6, V5Pro, and V5 kits, and is also seperately available.