For Rokinon/Samyang 14mm f/2.8 IF ED UMC, For Filters 150mm Wide, 2mm Thick, Holds up to 2 Rectangular Filters, Rotates 360°, Easy Installation, Aluminum Alloy Construction. This NiSi 150mm Q Filter Holder is designed to allow for the convenient use of 150mm wide 2mm thick filters with a Rokinon/Samyang 14mm Ultra Wide-Angle f/2.8 IF ED UMC lens without vignetting. Use of the filter holder is easily accomplished by first sliding it over a Rokinon/Samyang 14mm Ultra Wide-Angle f/2.8 IF ED UMC lens's integrated hood. The filter holder's screw-on locking pin helps to provide a reliable connection while the holder can be rotated 360? permitting the use of graduated neutral density and other filters that are enhanced by varied positioning. The NiSi 150mm Q Filter Holder for Rokinon/Samyang 14mm f/2.8 IF ED UMC Lens is pre-installed with two pairs of filter slots a configuration that accommodates up to two rectangular filters.