Seamless™ Follow Focus Gear for Sigma 24-105mm f4 DG OS HSM Art Lens
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This gear fits the Sigma 24-105mm f/4 DG OS HSM Art lens.
It is designed specifically to fit this lens and is compatible with any standard 0.8 Module follow focus. The gears do not have to be removed after each use although you can if you like. Each gear comes with a lifetime of support.