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 (will not wear the lens), durable, 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. NEX adapter ring use: 1. First, in the camera menu, enter the setting option "No Lens " to enable it. Generally, the assist focus is turned on by default, that is, when the focus is achieved, the red is dense. It is best to set it to use the adapter ring. 2. Using LCD focus, composition and metering are all easy to control, all are manual focus, convenient and fast! 3. You can use the MF zoom in focus function (usually soft key B, the button in the lower right corner), 7 times or 14 times zoom in focus, to achieve the focus function 4, You can use the M file or A file (supports automatic metering) mode to Colour: black Material: aluminum Size: 71x42x70mm Package Contents: 1 * 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.