Did you bother reading any of the above? The RF 400/2.8 optical design is 17 elements in 13 groups, and the Canon RF 2.0TC has 9 elements in 5 groups. The RF 800/5.6 has 26 elements in 18 groups, which is exactly the same as adding the 2.0TC onto the 400/2.8.
Sorry - when I searched "RF 800mm f5.6" on the Canon Canada website, I didn't realize it was showing me the EF version, which only has 18 elements.
Dec 21, 2023 at 03:49 PM
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