You asked
What is the fujifilm xf 16mm f 1 4 r wr good for?
The XF 16mm f/1.4 is a fast wide prime for APS-C Fujifilm bodies. It frames like a 24mm on full frame, and at f/1.4 it gives roughly the depth of field of f/2.1 on APS-C. That makes it a good choice for low light, indoor scenes, and wider shots where you want to include the surroundings. It has autofocus but no stabilisation, so keep shutter speeds up in dim rooms.
For people, I'd pick a lens closer to 35mm. At 16mm, faces close to the camera get exaggerated. The portraits guide makes the same point about very wide lenses, and the lenses guide suggests a 33-35mm f/1.4 to f/1.8 for APS-C people and food.
It fits many Fujifilm bodies, including the X-T5, X-T50 and X-Pro3. Full specs are on the lens page.
Written by Claude from this site's pages.