The NiSi 100mm Filter Holder for Sony Fe 14mm f/1.8 Gm allows for the convenient use of up to two 100mm wide, 2mm thick filters on the Sony Fe 14mm f/1.8 Gm. The holder has no vignetting with the holder in the upright position (or 90 degrees) and some vignetting with the holder, not in the upright position (45 degrees).The kit consists of two main components, a front filter holder and a filter holder adapter ring. The filter holder can quickly be mounted to the adapter ring after first mounting the adapter ring to the lens. The adapter ring has four guides that sit in the lowest part of the lens hood and then by rotating the back ring which will tighten the adapter around the lens. Lastly, tighten the silver lock knob to ensure the adapter is firmly attached to the lens.