I was a little bit worried about too much low price. I wasn't exactly sure if I'm going to get an original one. But I got the device (most quickly I got ever!) and I was pleasanly surprised by really good quality. The focusing of course slower then in original camera (I use it on Olympus OMD 5 MII with Canon lens EF 200mm 2,8L), but it normal. I didn't compare it with (now x5!) more expensive analoge from metabones, but I like the result of my shooting with it. In my opinion it absolutely worth its money!
Verified purchase: Yes | Condition: New
I’ve had this adapter with intentions of using my canon 50mm 1.2 and my 100mm macro lens but sadly found out that those two lens don’t work at all with this speed booster. The AF and the F stop are disabled and non responsive, I’ve tried updating the speed booster and that did nothing at all. Not so happy with this speed-booster read reviews which were more good than bad but the bad does exist.
Verified purchase: Yes | Condition: New
I'm using that adapter with m42 and c/y lens, so can't really comment on ef electronic features, but optically I'm totally happy, especially for the price.
Verified purchase: Yes | Condition: New
Solid quality, feels pro, works with my Canon, Sigma, and Tamron EF EOS lenses perfectly, fast auto focus and full control of the aperture. With the "shoot without lens" option set, I can also use my vintage Asahi SMC Takumar prime lenses. Its fantastic and restores a great deal of the wide angle lost to the crop of the sensor. Also, it adds approximately a full stop of aperture so its brighter in low light situations. GREAT VALUE!
Verified purchase: Yes | Condition: New
Like all focal extenders, the sharpness of the image is greatly decreased. This seems to be most evident when combined with an already long focal length (100mm or more). The build is very solid, and pass through electronics function well. Be sure to research lens compatibility on the Sigma website.
Verified purchase: Yes | Condition: Pre-owned
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