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.

I went for this one for my new Canon EOS RP since Canon's own is sold out. Works well. Works as it should.

Extremely pleased with this lens for video and photos. I am using a Canon RP so I have to use an adapter but I am having no issues at all.

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.

Canon EOS M Mount adapter is a must have for all Canon EOS M users if they have other Canon EF and EF-S lenses. The construction is solid and heavy. I used several Canon EF-S and EF lenses and they work fine with the adapter. Highly recommended.

I have a Canon EF to EOS R adapter for an EOS RP camera and I bought this adapter to reduce the swapping. From what I can see it works as well as the Canon one. I tested it on a 17-40 F4L and on a Sigma 100-400 5-6.3 C and I saw no difference. So I'm very happy with it.

My experience with Canon has been with the T3i, T6, 7dmk2 and 6dmk2. Each of these cameras were good in their own ways, but were not perfect. IQ was my biggest complaint, especially in low light.The R6 definitely has better IQ than these previous cameras and performs much better under low light conditions. The eye focus feature is helpful but takes some practice to learn. The images I get with my R6 compared to my 6dmk2 are noticeably sharper and show better tones overall.I am currently using only EF lenses on my R6 thanks to Canon's brilliant adapter! All my EF lenses work flawlessly on my E6 thanks to Canon's adapter. I'm waiting for Canon to release more primes in the near future to keep my R6 kit lightweight.As for the negatives, I'm not a fan of electronic viewfinders. Nothing beats the optical viewfinders of Canon's older dslr's. Also, a top lcd display would have been nice, but it's not a dealbreaker for me.Overall, I highly recommend the R6, especially if you own multiple EF lenses (just remember to purchase the adapter).

Adapter works great, it lets me attach my EF and EF-S lenses to my Canon EOS M without any issues.