On a related subject, I remoted one of my mirrorless bodies this weekend and tried it with the full frame subject tracking (auto subject detection) and it worked a treat. My go to lens for remote is a 70-200 F4L thats 20 years old and auto focus has failed, but the tests this weekend were a game changer. I might just have to find a second 70-200 second hand where the auto focus actually works.... The benefits of the R6ii or R5 remoted autofocused with the ability to keep the F number down, increase the shutter as a result and push the ISO more were a gigantic step forward... I even proped the RF 400 F2.8L on a monopod against an upturned Tree stump and remoted it with the R5 full subject tracking (The TR7 shot)
1A2A5957 by
Andrew_S84, on Flickr
5G4A7468 by
Andrew_S84, on Flickr