Another option for a power zoom, parfocal lens, if you can live with a slower f/4 lens, is the new Canon CL-E Zoom, used with the Metsbones EF/MFT Speed Booster. If you do not have a good B4 lens laying around, might be less expensive than going the optical corrected adapter route. But, if shooting live events with a B4 ENG lens is what you are looking for, the Ursa Boradcast Camera is another option, comes with the optically corrected B4 mount, and powers the zoom from the camera, with all lens features enabled on the lens, zoom rocker, push to set iris, etc.
If using your GH5 is required, then the Panny Leica 12-60 f/2.8-4 Zoom, is another option for a parfocal Zoom, while it is not a power zoom, the manual zoom is very smooth and easily controlled. This Zoom is also a hybird kens, designed for both still and video shooting, with a smooth iris setting, no steps with very fast and quiet focus and iris motors. I used one to cover a parade on a AF100 and it worked very nicely. Excellent IQ and quick and easy to use with moving subjects, and your auto focus and dual IS will also work. This lens is also smaller and lighter than an ENG zoom also.
Cheers
If using your GH5 is required, then the Panny Leica 12-60 f/2.8-4 Zoom, is another option for a parfocal Zoom, while it is not a power zoom, the manual zoom is very smooth and easily controlled. This Zoom is also a hybird kens, designed for both still and video shooting, with a smooth iris setting, no steps with very fast and quiet focus and iris motors. I used one to cover a parade on a AF100 and it worked very nicely. Excellent IQ and quick and easy to use with moving subjects, and your auto focus and dual IS will also work. This lens is also smaller and lighter than an ENG zoom also.
Cheers
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