I recently decided to make the switch from a Canon DSLR to a Canon R mirrorless. It was easy to learn since I'm already used to Canons. I bought the EF to RF adapter (with the adjustable ring) so I could use my DSLR lenses with it. My only complaint is that Canon should give you the adapter free (they used to!) when you buy the camera. So far, it's taking good photos, and I decided to buy the kit lens that goes with the camera, so I can use it for all-around use when I'm out and about. I have a very nice Sigma macro lens that I bought at the same time, which needs the EF to RF adapter, but it takes very nice macros on this camera. I'm glad I bought it.

Nice adapter with good autofocus...we can use all canon DSLR lenses..

Absolutely perfect adaptation of EF lenses to my M series cameras. Basically feels like native lens. I have also used a third-party adapter, which is fine, but the AF takes just a little longer. Seems to have to micro adjust, whereas Canon adapter is just instantaneous.

I use this with my Canon M50 so I can use my older EF and EF-S lenses. It works great with both! The autofocus features on my lenses work the same way they did on my previous Canon. Very happy with this adapter.

Good lightweight camera. Great value and with lens adapter I can use all my EF lenses.

The adapter is good, delivery was also very fast, i got it just in 1 day.. But if you really wanna use EF or EF-S lens in mirrorless cameras, you have to keep in mind that the sharpness will decrease by a little amount and you you have to focus the subject very correctly, otherwise the picture will become blurry(specially for the prime lens)..

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.

After returning first unit due to inability to autofocus consistently (adapter fit was slightly loose), tried replacement unit and was very pleased that performance compares favorably with both Canon and Viltrox models. Based on my experience, I would strongly recommend testing unit as soon as possible after receipt.