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I finally own a decent follow focus. It's a used Zacuto Z-focus. Works great, smooth turn, zero play. I'm using it together with a Sigma 18-35 f1.8, with a this ultra cheap focus ring: https://www.amazon.com/Neewer-Adjustable-Follow-Lenses-diameter/dp/B008PP3LY4/ref=sr_1_2?ie=UTF8&qid=1486941772&sr=8-2&keywords=neewer+focus+ring The Sigma lens itself has a buttery smooth focus turn, and like I said, the Z-focus is basically silk when it's just spinning by itself. But the moment the Z-focus is actually put to use turning the Sigma lens, it takes a little more effort to turn than I feel it should, and there are some subtle vibrations in the movement. Adds up to a less-than-stellar focusing experience. I had a similar problem when I first got the Sigma and the Z-focus. I'd bought a gear ring that was specially fitted to the Sigma, and it proved totally unusable--vibrations galore. Is this a normal problem with cheap, crappy focus rings? I can't find anyone else who describes experiencing this issue quite like I have. Help!