Add a focus gear ring to your 66 to 68mm lens without the extra slack or screws required with this Seamless Focus Gear Ring from SmallRig. The seamless ring allows you to use standard 0.8 MOD cine gea espandi...rs on a compatible lens for use with cine follow focuses. This 66 to 68mm size fits virtually all lenses of the same outer diameter, and it is compatible with a variety of follow focus motors such as the SmallRig Mini Follow Focus.