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.Workmanship: The workmanship is very delicate, and it is closely and smoothly combined with the bayonet.Note: When using the adapter ring for the first time, please turn on the Shutter release without lens option in the body menu, otherwise the adapter lens will not be recognizedApplicable to Zeiss CONTAREX Cyclops Bullseye series lenses, adaptable to all M-mount series bodies such as LM (suitable for Le Big M/M10/M240 series digital bodies, support live view), and also suitable for RICOH M series bodies. Does not support macular focus, support peaking focus and zoom focus of big M.color:BlackMaterial:MetalPackage Contents:1 x Lens Adapter RingOnly the above package content, other products are not included.Note: Light reflection 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.