1,Made of metal, high strength and non-deformation, super smooth surface finishing. 2,The lens mount adapter is suitable for M42 screw C mount lens to mount for M4 or 3 camera body, like for Olympus or for camera body. 3,Completely manual control, supports manual focus and manual exposure. 4,Allow focusing to infinity. 5,Precise thread ensures firm connection between lens and camera body. Features: 1.Made of metal, high strength and non-deformation, super smooth surface finishing. 2.The lens mount adapter is suitable for M42 screw C mount lens to mount for M4 or 3 camera body, like for Olympus or for camera body. 3.Completely manual control, supports manual focus and manual exposure. 4.Allow focusing to infinity. 5.Precise thread ensures firm connection between lens and camera body. Specifications: Material: aluminium alloy Color: black Size: Approx. 5.8 x 1cm or 2.3 x 0.4in Suitable for M42 screw C mount lens to mount for M4 or 3 camera body, like for Olympus or for camera body. Settings: Put the red mark of the adapter ring and lens ring together. Turn the adapter counterclockwise until the fixing equipment clicks. In most cases, it will use manual or AV mode. Removal: To remove the adapter ring, loosen the retaining pin and turn the adapter clockwise. Packing List: 1xLens adapter ring Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.