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

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.

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.

What isn’t there to like, pictures are sharp and of amazing quality at only 20mp (Canon RP)

I am using the flash on my Canon RP. I am very familiar with external flashes, but for some reason this flash will only fire once every 6-10 shots. Not happyUpdate: I was contacted by Canon who immediately fixed my problems. Turns out I didn’t do enough research, and I was using standard AA batteries which lead to a super long recharge time for the flash. Canon advised me to switch to rechargeable batteries and it instantly fixed my problem- now the flash fires every single time and has been absolutely perfect!