100-400L + stacked teleconverters and 800 + 2x TC ? Really ?

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mermaidkiller Senior Member • Posts: 1,222
100-400L + stacked teleconverters and 800 + 2x TC ? Really ?

100-400L f/5.6 + 1.4 + 2x TC == 1120mmeq f/16

https://www.kenrockwell.com/canon/eos-r/r.htm#tc

800 f/11+ 2x TC == 1600mmeq f/22

https://www.kenrockwell.com/canon/eos-r/lenses/800mm.htm

And the camera can still focus the very dark image ?
Obviously an R class body AF's much better than a D class body, but still ... so dark / dim image ?

Almost unbelievable, but did anyone other than Ken Rockwell try it ?

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