Venus Optics just announced an adapter which allows to use Full Frame Canon EF and Nikon AI lenses on the Fujifilm GFX 50s. But it’s different from the existing products (Fotodiox / Kipon) in the market.
Because of the smaller image circle for DSLR FF lenses, when you use FF on GFX with an adapter, there can be more or less vignetting. However, Venus Optics has included glasses into their adapter which can enlarge the image circle of the FF lenses and so it can be used with GFX even with the wide angle lens without vignetting.
However, keep in mind that “it has a focal length multiplier of 1.4x and reduces the maximum aperture by 1-stop.”… which makes it a teleconverter/adapter.
Their are looking for beta testers… more below in the official press release (dowload RAW files)
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Fujifilm GFX 50s: BHphoto, Adorama, AmazonUS