This cable - and I have two of these, I'm trying to get it to work - is not properly rated. The cable stays in the motor ONLY when you actively push it. works exactly as expected - more grip and speed for the focus motor. If you let go, the motor will stop. Obviously keeping your hands on the cable all the time on a rigged camera is not acceptable. I don't have this problem with any other micro USB cable; I don't know if the plug is too small/big/short/long, but it isn't.
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