Pixco EMF AF Confirm M42 Lens to Canon EOS EF Mount Adapter Ring (Silver/Flange)5D III 70D 100D 650D 700D Able to focus infinity in manually. Gives you confirmation signal once you focus objective accurately. EXIF is 1mm-65535mm, f1.1-f64 With stop screw & lens lock. Allows adjust aperture & focal length.