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GH5 focus with Speedbooster, big difference photo vs. video mode

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On my GH5, I noticed a strange behavior with Canon and Sigma lenses with the Speedbooster (but not with native Panasonic lenses without adapter):

With the exact same aperture and shutter speed settings, the autofocus of the camera is much faster in manual photo mode than in video mode. In some cases, in video mode the focus hunts and the lense won't even focus. When I switch to manual photo and press the shutter halfway, lenses focus immediately.

The "synchro scan hack" has no effect. I'm running the latest GH5 firmware. Does anybody have a remedy? Many thanks!

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