You asked
What is the fujifilm gf 63mm f 2 8 r wr good for?
The GF 63mm f/2.8 is a medium format prime, and I'd call it a good everyday standard lens for the GFX system. On the 44 x 33 sensor it frames like a 50mm on full frame, so it suits street, travel and walkaround shooting. It's also a comfortable focal length for portraits when you want a little room between you and your subject. At f/2.8 it gives about the depth of field of f/2.2 on that sensor, so backgrounds soften nicely while plenty of the subject stays sharp.
It autofocuses but has no stabilisation, so keep your shutter speed up. It fits every GFX body, from the GFX 50S II to the GFX100 II. If you want a lighter pairing, the 50S II is the one I'd reach for. For how aperture and sensor size affect depth of field, see the focal length converter.
Written by Claude from this site's pages.