Here is a puzzle for you.
Why doesn’t camera viewfinder (dslr, mirrorless, superzoom etc) show globe effect?
The distortion is pure rectilinear, which supposedly should cause extreme globe effect.
When zoomed in, the magnification can be similar to binocular. The AFOV is pretty good too.
So in addition to:
And uniformity of distortion/higher order distortion
(Distortion and globe effect in binoculars)
I have yet to see anyone describe this phenomenon, which I think is a major contributor to why some binoculars have stronger rolling ball globe effect than others.
Focus the binocular to infinity, then look at straight lines in the foreground. Then repeat the opposite.
Not sure what this is called, something similar to focus breathing which is a change in magnification, except here it is a change in distortion in the out of focus planes.
(And as you can imagine, panning will cause the background to bowl, and foreground to ball, which completes the rolling globe appearance)