Agreed. I use my R7 on the RF 800 f/11 in the same way. I will say that there isn't a material difference in either IQ or AF performance between the R7 without the TC and the R5 with the TC and 1 stop higher ISO, but losing the extra length of the TC is convenient. Mostly, I just keep the 800 on the R7 so I have "reach at the ready" and keep the RF 24-200 on the R5 for maximum flexibility. All my other glass gets used with some pre-planning. In the special case of the RF 800 (and 600) f/11, the crop frame is an advantage because of the limited AF area with that lens, but generally speaking, I would rather have a high res FF for the same pixel resolution with a wider field of view.The 7DII had the 5-series quality build and ergonomics and a faster fps and much more pixel dense sensor than the then latest 5DIII. It was used by pros like Glen Bartley on CR as well as enthusiasts. The Nikon D500 APS-C is one of the best birding DSLRs made with similar build quality. Anything that an APS-C can do can be done by an FF with 2.56x the pixels and a crop mode. The main difference is that the APS-C is cheaper. It would seem that both Canon and Nikon have decided to concentrate more on the cheapness of APS-C than having them of the highest quality. By the way, the RF 100-500mm on my R7 gives the resolution of that lens plus a 1.4x TC on my R5.
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