Besides size/weight, a challenge for me with telephoto lenses would be switching lenses in a rush because I see a bear.
It rather use the Sony 24-70mm or 18-105mm while hiking so I could swap from wide to semi-telephoto when I see wildlife.
That said, the best wildlife shots I captured were on a Sony ax53 handicam.  It’s horrible in low light, but it has a 200mm reach and gimbal like stabilization.  My wife used it on our Rae Lakes film project.



