You asked

Best camera for the canon rf s 55 210mm f 5 7 1 is stm?

The Canon RF-S 55-210mm is built for APS-C, so I'd pair it with an APS-C body. My pick is the Canon EOS R7, which uses the lens at its native crop. If you want something lighter for everyday shooting or travel, the Canon EOS R50 and Canon EOS R10 are also native APS-C and fit the lens just as well.

If you already own a full-frame body, such as the Canon EOS R6 Mark II, the lens still works, but it drops into APS-C crop mode and gives you fewer megapixels. That's fine for occasional use. For regular use, I'd pick one of the APS-C bodies above.

Also keep in mind that this is a slow zoom. It's at f/5 to f/7.1, so it does best in good light. If you're unsure whether a dedicated camera is worth it, Your first camera walks through that question.

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