Description Function: Full manual operation, manual focus, manual aperture adjustment, manual exposure with the camera body, aperture priority exposure, and focus. Material: All-metal precision machining, aluminum alloy ring body with fine copper bayonet ( not wear the lens), , and the inner wall is painted and matted to avoid reflection on the CMOS and affect the imaging. Workmanship: The workmanship 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 - Lens Adapter Ring Only the above package content, other products are not included. Note: Light 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.