You asked

Is the canon rf 85mm f 1 2l usm ds worth buying used?

I'd say yes, and the used market is a good place to look. Lenses are built to last, and the buying used guide makes the case that buying one or two generations back saves a lot without losing much.

The RF 85mm f/1.2L is a full frame lens, so it pairs best with bodies like the Canon EOS R6 Mark II or the Canon EOS R5. It also works on APS-C bodies such as the Canon EOS R7, where it frames like about 136mm. Check the lens over carefully before you buy: it has no image stabilisation, so you'll rely on the body's stabilisation or a steady shutter speed. Browse the full Canon RF lens range to compare options at different prices.

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