Make a wireless follow focus with Lego Mindstorms EV3

Make a wireless follow focus with Lego Mindstorms EV3.
Control the zoom and focus using the Lego Mindstorms EV3 app or desktop software.

3D printed part for Sigma 100-400mm lens can be downloaded at:

It is easy to design more lens belt for using with the Lego Mindstorms EV3.

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