You asked
Best budget lens for the canon eos r1?
For a budget lens on the Canon EOS R1, I'd start with the Canon RF 50mm f/1.8 STM. It's a cheap, fast prime that's great for people and low light, and it's the lens I'd put on the body first. If you'd rather have a zoom, the Canon RF 24-50mm f/4.5-6.3 IS STM covers everyday framing. For wider scenes, the Canon RF 28mm f/2.8 STM is small and simple.
My rule is to spend roughly as much on lenses as on the body, so a modest lens on a great body still makes good pictures. See your first camera for how I'd split the budget.
Written by Claude from this site's pages.