400 f/4 do II w/ 2x or RF 800?

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laueddy Contributing Member • Posts: 848
400 f/4 do II w/ 2x or RF 800?
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I have been using my R5 w/ the 100-500 which I think works very well.  However, I just used it with the 1.4x TC and find that the focus is so much slower and I simply get better result using the 100-500 w/o the TC.
With that being said, I still want to find get a lens with better reach, but I prefer something lighter, so 500 f/4 or 600 f/4 is out of the question at this time.

I am considering a 400mm f/4 DO II (Used) + 2x to reach 800mm or the new RF 800mm f/11?  Any suggestions?

 laueddy's gear list:laueddy's gear list
Fujifilm GFX 50R Canon EOS R5
Canon EOS R5
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