. Features: Make C mount lenses can be used on for Nikon F mount cameras. There is no ROM connection on the ring so diaphragm control of the lens is set manually . Please installing / uninstalling the adapter after turning off the camera. It is possible to use macro rings and other accessories. It can'for t for focus to for infinity, just for macro shooting (Macro shooting is difficult, please set to maximum aperture to facilitate focusing, turn the focusing ring to complete focusing, then adjust the aperture properly to obtain satisfactory depth of field). Mount Adapter Ring only, other accessories demo in the picture is not included SUITABLE FOR: lens: C mount lenses. camera: for Nikon DSLR cameras. Specification: Item Name: Mount Adapter Ring Material: Aluminium alloy Shape: Round Type: Lens Adapters Outer Diameter: 4.8cm/1.89'' Inner Diameter: 2.5cm/0.98'' Color: Black Quantity: 1 Pc Note: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x Mount Adapter Ring (without retail package)