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Best budget lens for the fujifilm x t30 ii?

If you want the best budget lens for the X-T30 II, I'd start with the Fujifilm XC 35mm f/2. It frames like 52mm on full frame, which suits people and everyday shots, and it's the sort of cheap fast prime I'd recommend in your first camera.

Two other sensible choices:

Check the lenses section for more options.

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