You asked
Is the fujifilm gfx100 good for wildlife?
Honestly, the Fujifilm GFX100 isn't my first pick for wildlife. It's a medium format body built for detail, and wildlife depends on reach and speed, which medium format gives you the least of. Its 0.79 crop factor means a 500mm lens frames like about 395mm, which is useful but still short for distant birds.
If you want to try it anyway, these are the lenses I'd look at:
- Fujifilm GF 500mm f/5.6 R LM OIS WR for the most reach
- Fujifilm GF 250mm f/4 R LM OIS WR if you want something lighter
- Fujifilm GF 100-200mm f/5.6 R LM OIS WR for the easiest start
Buying lenses used is the cheapest way to test this. For the bigger picture, see wildlife and sport.
Written by Claude from this site's pages.