You asked
Best budget lens for the fujifilm gfx100s?
The site doesn't list prices, so I can't rank these by cost. As a general rule, the slower zooms are the easiest on the wallet, so I'd start with the Fujifilm GF 35-70mm f/4.5-5.6 WR. It's a sensible everyday kit lens for the GFX100S, roughly 28-55mm on full frame.
For a cheap wide option, the TTArtisan Tilt-Shift 17mm f/4 ASPH gives you a lot of coverage for its job, though it's a manual tilt-shift, so expect to work for your results.
If you want a fast prime, the Fujifilm GF 50mm f/3.5 R LM WR is a clean, small standard lens. Check the full GFX100S page for every lens that fits.
Written by Claude from this site's pages.