Buy $699 RF 600mm f/11 IS STM Announcement date July 9th 2020 Days Since Last Release 241 Rumors Roundup Canon is thinking about more lenses like the RF 600mm f/11 STM and RF 800mm f/11 STM 117 The Canon RF 600mm f/11 IS STM and RF 800mm f/11 IS STM were inspired by lenses from the 1960's 42 Lensrentals.com: Canon RF 600mm f/11 IS STM Teardown 77