У вашего броузера проблема в совместимости с HTML5
UPDATE: Metabones firmware update: http://metabones.com/article/of/Firmware_Adds_Cinema_EOS_Lens_and_GH5
Also, the Full frame MF Assist was on all the GH cameras, but the quality level has improved tremendously, probably due to the increased megapixels.
A quick review on the GH5 about true 24 frames, variable frame rate issues, 10 bit codec issues, the manual focus assist options, and the speed booster XL canon mount.
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