Was just about to return this add-on (and the focus motor I bought) to my Ronin SC after several hours of unsuccessfully trying to calibrate the focus motor with my GH5. Here's the good news for GH5 users: when using lenses that work with autofocus, you do NOT need a focus motor. Just a focus wheel. Connect the GH5 to your computer, set it to manual focus and you can focus from the steering wheel. Wonderful! And I'm a complete idiot for not knowing that. If you only use manual focus lenses on the GH5, you'll need to add a focus motor as an accessory. This information could have been stated more clearly by DJI, but thanks to some YouTubers who clarified this for me. Please investigate.