I bought this device in addition to a canon EOS 6D to use while traveling. It is really nice, even if it seems very quickly switch to important ISO AUTO mode and therefore the quality suffers on. After, there is a compatibility problem non STM goals when you are in camera mode on the LCD screen or if you are in camera. Indeed, the development seeks to do is never succeed .... this with a Tokina 11-16mm f2.8 but also with a Canon 50mm f 1.4. But I decided to keep it in the end because the video and taking pictures with the LCD screen are not my main criteria for choosing a digital SLR
