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Is the canon eos 5d mark iii worth buying used?

Yes, I think the Canon EOS 5D Mark III is worth buying used. It's an older full-frame DSLR with a 22.3-megapixel sensor, and it's still a common used buy, so you can often get a lot of camera for less. That's exactly the kind of deal I think is worth chasing, as I explain in buying used.

It has no stabilisation in the body, so lean toward stabilised lenses for slow shutter speeds. A sensible everyday kit could be:

Budget for a new genuine battery too, since old ones lose capacity.

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