Features 1、Astronomical telescope accessories, easy to install, remove and operate the lens. 2、Full manual control, support manual focusing and manual exposure. 3、Adopts high‑quality metal materials, durable and sturdy, long service life. 4、No electrical connection in ring, no ROM connection, so the lens aperture control is manually set. 5、Ultra‑accuracy CNC machine, high strength, good operation stability, unlimited focusing. 6、For Nikon EOS M mirrorless camera, when using this adapter, auto diaphragm, auto focusing or any other functions will not work properly. Specification Item Type: Lens Adapter Material: Metal Color: Black Thread Size: M42x0.75mm / 0.030in Size: Approx. 24.5mm / 0.965in Compatible Lens: Fit for Sony, for Fuji, for Samsung, for Olympus, for Nikon, for Canon Package List 1 x SLR Ring 1 x Lens Adapter