The T2 Mount adapter allows you to attach your Canon EOS M EF-M Mirrorless Camera to T2 T mount lenses, telescopes, microscopes, enlargers, and bellows attachments that have a T2 universal thread mount. This adapter will work with any Canon EOS M camera body. The Canon EOS-M T2 Mount consists of an inner T Mount, that has an internal thread of 42mm, and a external ring that mounts into the Canon EOS-M camera sensor. The lens mount adapter is made with high standard precision. It's all metal design and polished surface is designed to guarantee smooth mounting and long lasting experiences. It allows T/T2-Mount Lenses to fit on the Canon EOS-M mount system camera body.Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. In this case "stop-down mode" will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body. You can shoot with manual mode or aperture priority mode.