You asked
What is the fujifilm gf 100 200mm f 5 6 r lm ois wr good for?
The GF 100-200mm f/5.6 R LM OIS WR is a stabilised, autofocusing telephoto zoom for Medium format (44 x 33) bodies. On a GFX it frames roughly like 79-158mm on full frame, so it's a mid-range telephoto. At f/5.6 it gives about the depth of field of f/4.4 there.
It fits the whole GFX line, including the Fujifilm GFX 50S II and the Fujifilm GFX100 II. Pair it with one of those if you want a medium format telephoto that's easier to handhold than a prime.
If you need serious reach for distant subjects, the wildlife and sport guide explains why a smaller sensor often gets you there more easily.
Written by Claude from this site's pages.