A telephoto lens is an essential part of a photographer’s camera kit but, until recently, there was no native option for Canon’s RF mount. And that’s where the Canon RF 100-500mm f/4.5-71 L IS USM comes in. It’s the first super-telephoto zoom lens for the EOS R-series cameras, adding an extra 100mm reach over the very popular EF 100-400mm f/4.5-5.6L Mark II DSLR zoom.
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https://www.techradar.com/reviews/canon-rf-100-500mm-f45-71l-is-usm
