Summary: If you are a EOS user with a range of lenses this adapter is perfect as they fit on the tiny EOS M3 body. There is a tripod mount in the adapter which takes any stress off the body.If you are a full frame user the lenses will have the appropriate factor re: the focal length.
Summary: It really is a no brainer getting this little attachment to add other 'professional'lenses. It gives you the flexibility to use your camera in more scenarios. Only 'downside' is the sheer weight of professional lenses in comparison to the light weight body of your camera.
Summary: This is an unusual bit of kit for these days. It only does one job and it does that one job to perfection. The tripod thread is definitely needed when you hang a 300 mm lens on the front of the tiny EOS M camera
Pros: Durable, Easily Interchangeable, Lightweight, Rugged, Strong Construction
Summary: Were it not for this little piece of kit, which I bought as part of a bundle, it is unlikely that I would have bought an EOS M3. The reason is that I wanted a small, lightweight camera that I could attach my EF lenses to and the adapter allows me to do just that.
Pros: Durable, Easily Interchangeable, Lightweight, Strong Construction, System Interchangeability
This solves using EF lens with a Canon EOS M Camera
4 June 2015
Summary: I purchased a 2nd hand Canon EF M Camera, to use at my sons wedding, I wanted to use an EF 16 - 35mm F2.8 Canon lens, as my lens of choice for the whole day, inside and outside, this allowed me to do that, I shot 1080P video and stills, a pro photographer shot the wedding as well.A shot is attached...