Commlite CM-AEF-MFT Auto-Focus Lens Mount Adapter Aperture Control built-in IS Canon EOS (EF/EF-S) Lens to M4/3 Camera Panasonic GH3,GH4,GH5,GX5, GX8,GF8,G85 Olympus OM-D E-M5,E-M10,E-PL8 BMPCC. My Canon lenses work with the new Commlite adapter optimally with auto-focus, Aperture choice and IS stabilization in the lens is very fast and good.
the Lens EF 600mm f4 L IS USM works on the Panasonic GH5 at with 1200 mm small picture format
the EF 100-400 f4. 5-5.6 L IS USM works at the Panasonic GH5 with 200-800 mm small picture format
the EF 24-105 f4 L IS USM works at the Panasonic GH5 as 48-210 mm small picture format