Material: Made of aluminum alloy (camera body mount), anodized construction. Solid metal mount lens adapter allows M42 Mount lens is used on for Canon EOS M EF-M mirrorless camera body. There is no ROM connection on the ring so diaphragm control of the lens is set manually. Allows focus to infinity. Supports AV / M mode. The adapter is the top quality in this line. Lens:M42 Mount Lens Compatible with:For Canon EOS M (EF-M Mount) mirrorless camera like For Canon EOS M M1 M2 M3 M5 M6 M10 M50 M100. Note: Please note Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. To use manual lenses on for Sony E-mount camera, please enable "Shoot without lens" function in camera menu. Note:Focus manually, please turn on the "no lens release shutter" option in the menu for the first time, otherwise it will not be recognized. Specifications:A:M42 - EOSM Without Baffle / B:M42 - EOSM with Baffle Color:Black Material:Aluminum Alloy Package Contents: 1 * Lens adapter ring Only 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.