Larger filter ring, longer minimum focus
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Larger filter ring, longer minimum focus

The general 'upsizing' of the 800mm compared to the 600mm extends to the filter ring, which is a less traditional (and less convenient) 95mm. The IS system in the 800mm is only rated to four stops, too, compared to five in the 600mm (rated as per CIPA, measured on an EOS R body). The minimum focus distance is longer, too, at 6m compared to 4.5m.

All of this probably makes the 600mm slightly more practical for most photographers, but there's no doubt that 800mm can itch some places that 600mm can't quite scratch. We suspect that both lenses will be a hit with fans of bird photography.

The RF600mm F11 IS STM and RF800mm F11 IS STM lenses are scheduled to be available at the end of July 2020 for an estimated retail price of $699.99 and $899.99, respectively.