I have a Samsung NX 500 and the adapter fits perfectly, I've tried it with a Canon EF lens and it's perfect. It only works in manual mode

This adapter fits my Nikon J1 perfectly. I can use my Canon EF 75mm-300mm lens.

I use this adapter on my Canon M50 Mark II and am satisfied. The old EF-L/S lenses can be used with it. That makes you want to keep using the old old lenses. The autofocus works without problems. Only the adapter is mostly made of plastic, but this has not affected the functionality so far.

needed an adapter to adapt EF/EF-S lenses to my Canon EOS M50 and I am enthusiastic about this K&F Concept adapter, the part is cheap and fulfills its purpose 100%, I also think the possibility of connecting the camera and lens directly to the Being able to attach the adapter to the tripod means that the weight of larger lenses does not weigh directly on the camera.

Have (as I'm sure most) no comparison to the Canon original adapter, which costs about 2-3x as much. The adapter works as expected for me in connection with a CANON EOS M100 and a Canon EF-S 55-250mm, I don't know what the original should be able to do better. Autofocus seems slower than with the EF-M standard 15-45 kit lens, but is sufficient for my needs. Covered the range from 15-250 inexpensively. Can't imagine that I noticeably miss the missing range between 45-55. Snaps in perfectly on both sides, sits firmly without misaligning in any way. It seems to me that it is built a little unnecessarily too deep, but I don't know whether the distance has to be like that for optical-physical reasons?

This adapter does the same job as the original Canon ef/ef-s to eos-m adapter. It is just a structural adapter that has no functionality of its own. I can absolutely recommend it. If you're on a budget buy this or even if you're not on a budget buy this and the extra money for a lens or other gear.

Yes... it works perfectly with Canon EOS M cameras. I own Canon EOS M10 and use this adapter most of the time with Canon 50mm 1.8 lens. It is amazing. The autofocus is accurate and fast enough. If you own a Canon EOS M camera, I recommend you this adapter because it is much cheaper than Canon original and there is actually no difference between them. Everything works as it should. I love this adaptor. The best purchase I've made for my camera.

bought the adapter to use my Canon EF 50 1.8 STM and my Canon EF 35 2.0 IS USM on my EOS M. The adapter fits perfectly on my EOS M. The lenses are almost too tight compared to the direct ones themselves, which suggests comparatively high manufacturing tolerances and is consistent with some other reports (hence only four out of five possible stars). Both lenses are fully functional and the autofocus also works perfectly. For example, I can't determine (without having measured this) that the EF lenses with the adapter focus more slowly on my EOS M than the original EFM lenses. I also find the low weight of the adapter very pleasant, so that at least my two EF lenses are not too top-heavy on the EOS M. Addendum on 04/26/2016: In the meantime I have to revise my first impression, because the adapter only seems to have been a little too tight at first. So I'm upgrading my rating by one star to 5 stars.