Function: Full manual operation, manual focus, manual aperture adjustment, manual exposure with the camera body, aperture priority exposure, and infinity focus.     Material: All-metal precision machining, aluminum alloy ring body with fine copper bayonet (will not wear the lens), durable, and the inner wall is painted and matted to avoid reflection on the CMOS and affect the imaging.     Workman: The workman is very delicate, and it is closely and smoothly combined with the bayonet.          color:Black     Material:Metal     size:71 x 42 x 70mm          Package Contents:     1 x NIK-C Adapter Ring          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.