Jul 14, 2021 ·  Canon has attempted to reinvent the super-telephoto lens with its lightweight, affordable RF 600mm F11 IS STM ($699.99). It's one of a pair of lenses of this type you won't find for any other... 

Sep 21, 2020 ·  The RF 600mm F11 IS STM is a super-telephoto fixed focal length prime lens for Canon's range of full-frame mirrorless cameras It has a fixed f/11 maximum aperture which you can’t go above or below. 

Sep 14, 2020 ·  By stark contrast, the new brace of Canon RF 600mm f/11 IS STM and Canon RF 800mm f/11 IS STM primes for EOS R-series mirrorless cameras offer a very different experience. They have a clever retractable design and the smaller of the two lenses shrinks to just 200mm for stowage. 

Oct 12, 2020 ·  The Canon RF 600 and 800mm f11 are a pair of relatively compact, light and affordable super-telephoto lenses for the full-frame EOS R mirrorless system. For this review I tested final production samples of both lenses, along with an RF 1.4x tele-converter, all on an EOS R6 body, and all running the latest firmware. 

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Canon RF 600mm F11 IS STM