If you have an M mount camera, this adapter lets you use the hundreds of Canon lens models made since the late 1980's, many very reasonably priced. The Canon adapter maintains the quick focus of the camera, and was selling at a steep discount on Amazon.

Are use this Lens mount on my new canon M 50, unfortunately the camera was defective but the lense mount did its job.

I use the tripod most of the time for Canon EOS 5DS R camera.

Incredible 2.8 lens and I was using my old 60D. Can’t wait to use it on my new Canon 5Ds!

I am now officially spoiled... Canon's new nanoUSM technology is a total marvel and they need to start advertising their lenses accordingly so we know which is USM and which is nanoUSM because I only want to use nanoUSM now that this lens has spoiled me. Now I'm not a mechanical engineer or anything but I want to try to explain the differences the best I can so you can understand what makes the focusing technology in this lens so great compared to even other high quality Canon lenses.The lowest quality auto-focusing system would be found in like the cheapy kit lenses, like the EF-S 18-55mm f/3.5-5.6 IS II lens. In that, it's a basic motor and gear. The end result is an auto-focus that is both noisy any slow. Being slow is negative for obvious reasons, being noisy is both annoying and if used while shooting a movie can drown out the audio of the subject of your video.The next step up (no pun intended) is the STM otherwise known as a stepping motor. With this, the focusing is still slow, but this time it's very quiet. These lenses were designed to allow for auto-focusing during videos without the sound being distracting during the video. But the problem is that it's still slow.A step up from there is the USM otherwise known as the ultrasonic motor. Now here's the confusing thing, there is now 3 types of focusing mechanisms that are all labeled with "USM." This is why I said I wish Canon would advertise their lenses accordingly to the type since not all USM lenses are created equally. Before there was the Micro type and the Ring type. The desired one then was the Ring type. But basically the advantages of USM lenses is that they focused very quickly, and more quietly than the cheap motor one but still a little more noisy than the STM (in videos you'd hear like a chirping sound) but since it's fast and the focusing occurs quickly it shouldn't distract that much. The difference between the Micro-USM and Ring-USM is the Ring allows for full-time manual focusing even while you're in auto focus mode. SOME Micro-USM allowed for it but not all.But now there's a third type, and this is the newest one, one I think, and wish, Canon will make all of their new USM lenses with this technology. They call it "nanoUSM." Basically nanoUSM combines the advantage of the STM lenses of being quiet, with the advantages of the Ring-USM lenses of being very quick to focus and allowing for full-time manual focus. Basically it's the best of all worlds, lol.Now that we got that out of the way, this EF 70-300mm f/4-5.6 IS II USM Lens is the third type, the best type, the nanoUSM. So far I'm in love with the focusing mechanism and the lens itself is a very well-built lens. The optical lens doesn't rotate with focusing or zooming like the cheap ones do, so you can attach a lens hood or a polarizing filter without needing to constantly adjust it as the camera changes focus or zoom. But that's expected from anything but the cheapy kit lenses. Just figure I mention it, not claiming this to be some revolutionary feature or anything.I would comment on the typical things you would look for in a review for a telephoto lens such as chromatic aberration and vignetting, but I'm using this lens on an APS-C camera, or a crop-sensor camera. So I'm actually not making any use of the edges of this lens. Meaning I'm not getting any noticeable chromatic aberration or vignetting in my photos at 300mm, but that doesn't necessarily mean that someone else wouldn't using a full-frame camera. So basically I can't really reliably say if it does or not...But in regards to the other aspects of it, it's great. The image stabilization is much improved over the cheaper lenses I used before, getting sharp handheld shots even with somewhat slow shutter speeds. The focusing, as explained before, is extremely quick and silent thanks to the nanoUSM technology. Turning the zooming sleeve is very smooth on my lens, so no complaints about anything there. So far I'm very satisfied with this lens and for me is another good experience with a typically high quality Canon product.

Digital correction is applied heavily on R mount canon cameras with this lens, but the end result is excellent. It’s not perfect.. coma is obvious with Astro-photography. But for the price, TINY size and weight.. I love it !! Ditching my old 16-35 in favour of this little gem.

So you finally decided on getting the EOS M (it's flaws considered). I assume you are a canon user, have a couple of good (canon EF/EF-S mount) lens lying around and would like to be able to use those on you EOS M. Just like me, you love your canon dslr but sometimes wish you can travel light but still be able to enjoy the canon ecosystem that you have grown to love. If you are what I assume you are, get this lens adapter.I took a gamble and bought a "like-new" used from a seller at Amazon and was very happy with a purchase. For anything more than $150 I probably would think twice. But I am not taking a start out because of the price. This adapter handles every canon mount lens I threw at it. The build quality is nice. The design (the way it attaches to the eos m; the included, detachable tripod mount) is well thought of... just perfect.

Solid little tripod that will mount just about any size lens or camera combination. I have used with with a 400mm Canon lens attached to a Canon MarkII. Very compact fits on my back pack. Easy to adjust to any uneven surface.