Review on Fotodiox Pro Lens Mount Adapter With Auto-Exposure, Auto-Focus And Auto-Aperture, Canon EOS EF EFs Lens To EOS M EF-M Camera Body by Carlos Barete

It works, that's what matters the most. I'm using this as part of a cage set up for video, allowing me the flexibility of the EOS EF line with the portability of the EOS M. I haven't had any problems with movement between the lenses and adapter as some have mentioned here, but I'm not hand holding anything for stills or video. My complaint is the sloppy fit between the adapter and the tripod mount. I've tightened it up as finger tight as possible and there's still plenty of lateral play. Not a huge concern once I'm shooting but if I've got the image framed up properly, it all goes to pot once I hit the record button and the shot moves to the left causing me to re-adjust immediately.