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I know there is No such thing as a perfect product. The Metabones works great except two things! The adapter does not fit perfectly One the MFT mount and twists and move slightly. I doubt it will come loose though. The AFC on the camera is even worse than with my native lense. It hunts a lot and makes noise. MF is the way to make sure it gets to focus right. Other than that its very good. My current setup is a Gh4 with the Metabones and a Sigma 18-35 f 1.8 And the picture quality is awesome!
Verified purchase: Yes | Condition: New
The Speed Booster does almost everything as advertised except the focusing speed, particularly for long focal zoom lens. With the Canon EF 100-400mm f/4.5-5.6l IS II USM lens, for instance, focusing at the longest focal length is a no go. Therefore, some of the purposes of this lens, like BIF or fast moving far subjects, can not be used. However, even not specifically on this, the producer claims they are striving on improving this aspect.
Verified purchase: Yes | Condition: New
I love this Metabones Speedbooster and I have fully committed to EF lenses instead of MFT. However, I wish the Speedbooster would be a bit more tight in it's lock between the adapter and camera body. It has a slight wiggle which is very disturbing at times. I still highly recommend this product though.
Verified purchase: Yes | Condition: New
It works perfectly with my sigma 18-35 mm.. the auto focus communicate perfectly with the lens.. totally love it :)
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New