EF/EF-S Lens to Sony E Mount T Smart Adapter, Auto Focus Lens Adapter Ring for Canon EF/EF-S Lens to Sony E Mount Camera (CEF-SE)

Does what it claims.

Very easy to use, and good quality

So I got one EF lens to use on my Sony A7s and FX3, the Sigma 70-200. Wanted an adapter I could just leave on the lens. This one looked well built with a relatively low profile and was firmware upgradable. It is a tight fit but like I said, I was going to leave it on. It worked but the auto focus did not work, at all. It would focus and then go back out and stop. Every time. With a little digging I finally found the firmware page for it and it said there was no update. Not that big of a deal as I use manual focus most of the time for what I do. The bigger problem was I got back from my first trip with the lens and this adapter and I noticed that all of the pictures with it had a slight vignette. Borrowed a Metabones adapter and the vignette was gone. Updated the Metabones and the autofocus worked. This one now sits on the self.

Autofocus still works but takes much longer. Not suitable for video, photos take longer. Still worth it.

Fit to camera is to tight. Must use to much force to get it to lock. May damage brand new camera. Auto focus is marginal so must use manual focus. This adapter is poorly made and do not recommend buying as it may damage your camera and lens.

Super slow focus, not very reliable. I’ll be returning and ordering from another seller

Video Autofocus is not working on Sony A7C

I hardly used this and it has caused me so many issues with my lenses. It broke on me.