R5 with RF 800mm f11 or EF100-400 Mk2 and 2x for birds?

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danferrin Regular Member • Posts: 392
R5 with RF 800mm f11 or EF100-400 Mk2 and 2x for birds?

Wondering if anyone has experience with these options or has seen any reviews and comparisons.  I have the EF 100-400 Mk2 and 1.4 extender and it works pretty well on my 7D2, but when I get my R5 I want the extra reach.  Just not sure what compromises each will have compared to the other, and there is no way I can afford the Big White route.

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My life is a circle of confusion - photography is my meditation.

 danferrin's gear list:danferrin's gear list
Canon EOS 7D Mark II Canon EOS RP Canon EF 20mm f/2.8 USM Canon EF 85mm F1.8 USM Canon EF 20-35mm F3.5-4.5 USM +16 more
Canon EOS R5
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