You asked
Best budget lens for the fujifilm x t20?
If you want the best value on an X-T20, I'd start with the Fujifilm XC 35mm f/2. It frames like a 52mm on full frame, which makes it a good all-round portrait and everyday lens, and it's the kind of cheap fast prime I recommend in your first camera.
For a single lens that covers most situations, the Fujifilm XC 16-50mm f/3.5-5.6 OIS II is a sensible, affordable zoom. It has optical stabilisation, which helps since the X-T20 has none in the body.
If you want a little more light-gathering for low light, look at the TTArtisan AF 35mm f/1.8, a budget autofocus prime with a similar 52mm-equivalent view.
Written by Claude from this site's pages.