The Opteka Auto Focus Lens Adapter for Canon EOS EF Lenses to Canon EOS-M Mirrorless Camera enables you to use your Canon EF DSLR lenses with the EOS-M mirrorless digital camera, which has an EF-M lens mount. It is fully compatible with all lens functions, including image stabilization, electronic aperture control, and autofocus. And, included with the adapter are front and rear caps for storage.