Full-Frame Canon EF 100-400 4.5-5.6L II

[pauliusm]

Supernice lens, works well with extender EF 1.4x II giving you total 560mm.
Even with the extender autofocus works on EOS-R (it shouldn't according to the manual). Of course EF-RF adaptor was used.

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[Wings and Things]

I used this setup when I had the lens & 1.4 and worked perfectly well on auto. I do prefer the RF 100-500 though.

 

[pauliusm]

And how do you compare both setups? 100-500 probably lighter and more compact, but besides that?

 

[Wings and Things]

Personally I find the results are a bit sharper. Also just the lens I find better balanced. I also have the much lighter RF 100-400 and use the 100-500 when I don't have to carry it too far. It is also my wife's lens so another consideration!