You asked
Fujifilm gf 45mm f 2 8 r wr vs fujifilm gf 55mm f 1 7 r wr?
Both lenses fit the same Fujifilm G cameras, so the choice comes down to what you want in the frame.
The Fujifilm GF 45mm f/2.8 R WR frames like a 36mm on full frame. That wider view suits travel, street and environmental shots where the place matters as much as the person. At f/2.8 more of the scene stays sharp.
The Fujifilm GF 55mm f/1.7 R WR is my pick for portraits and low light. It frames like a 43mm on full frame, and f/1.7 gives about the background blur of f/1.3 there, so your subject separates from the background much more easily.
My rule: take the 45mm when you want context, and the 55mm when you want light and separation. If you're unsure how aperture changes blur, the focal length converter explains it.
Written by Claude from this site's pages.