K&F CONCEPT EF - E IV AF Mount Adapter - Review 

Just discovered this guy and please keep sending him stuff, companies. I trust his judgement.

Amazing technology formed to build such a device, ingenious. Thank you Bob!

Thank you for this review, which is exactly what I needed to know what to get and if I can use certain things in my shopping list! Cheers and keep posting great content!

Foolishly bought a FX30 without verifying the lens I use on my Canon 7dm2 would work. This guy just saved me a couple hundred bucks by not going to the MC-11

I love kf concept for a lot of things. I wish they made a Canon EF to Nikon Z or even a Sony E to Z AF adapter.

"Sconpho" EFS to NEX AF adapter can do the same, but costs 4 times less

Looks a lot like the 7artisans, seems to be just another branding for the same product. By the way, 7artisans adapter has been praised by everyone, apparently is the best put there.

Does it have a weather sealing gasket on the camera side of the adaptor ?

Will it work with the old ef film camera lens? Thanks

I cant find this autofocus capable mount adapter on their site or anywhere their products are sold. Is it available?

Great Video. What about autofocus in Video Mode?

sir suggest which camera brand is best now a day

I just got my k&f concept EF-E iv doesnt work with SONY A7RV to Canon EF lenses. It actually attached well both to the sony side and the canon lens side but auto focus will never work and the appature immediately becomes F1.0 from F2.8. of canon EF 20-35mm. I am forced to do a return. all this reviews doesn't count if you faced the same issue I faced. My sony litrarilly hang/ freeze immediately. if there a solution someone should tell me. am willing to buy it back.

How quickly AF focuses ?

Can I use it on the sony a7iv?

Well, I bought it, with flash attached camera had a about 4 seconds delay after pressing the shutter. Unusable.