Specifications: Compatible lens: for Canon EF series lens;  Compatible cameras: for Sony NEX series with E-mount (Including Sony NEX full-frame camera A7/A7R);  Front mount: for Canon EF mount;  Rear mount: for Sony E mount;  Tripod screw: 1/4 screw;  Max. diameter and length: 66.6 x 26.0mm;  Color: White;  Item size: 8 x 6.6 x 3cm / 3.1 x 2.6 x 1.2in;  Item weight: 120g / 4.2oz;  Package size: 10.2 x 9.3 x 5.3cm / 4.0 x 3.7 x 2.1in;  Package weight: 218g / 7.7oz;     Features: 100% NEW and high quality. Auto-focus function.  Aperture exactly being aligned via the mount adapter.  Built-in IS function.  Full-frame adapter aperture hole design perfectly supports For Sony full-frame camera A7/A7R.  Zinc alloy core makes the adapter strong and powerful.  Gold-plated pins bring the great conductivity of signal transmitting.  1/4 Female thread screw for mounting onto the tripod.     Advice To Use: 1.With some MF lens, you need to Turn on shoot without lens to use with it.  2.Some Lens can mount, but be careful with retractable lenses.  3.Electronic autofocus. Focus infinitely. High-technics treatment on the contact pins, permitting perfect signal transmitting between lens and camera. Support the existing function of the lens.  4.Focusing speed would be a little slower than the original EF-EOSM ring adapter.  5.Theres a little delay to display the Aperture value sometimes.  6.May be when it turns to AF mode, theres no Aperture value on LCD, and you should shut down the camera, and then itll display.     Fits To Which Cameras body: Body with S0NY NEX E-mount, such as NEX-3C(NEX3) NEX-3N NEX-5C(NEX5) NEX-5N NEX-7 NEX-C3 NEX-F3 NEX-5R NEX-6 NEX-5T A3000 A5000 A5100 A6000 A6300 etc.  OK for A7/A7R/A7S/A7II, but theres a dark corner or black line on the edge of the photo.     Package Included: 1 x Auto Mount Adapter.  1 x User Manual