From a discussion in another thread I tried a small experiment to test the idea of
"Foreshortening" or perhaps "Compressed Perspective" or perhaps other such
expressions when shooting with telephoto lenses.

My assertion is that "perspective" changes ONLY when you change the subject distance
AND NOT when you change only the focal length of the lens.

By "perspective" I mean the relative placements of different subjects in the field of view.
This means "distances" and "angles" between them, as far as can be determined in an image.

Below are two shots of a scene taken from the same position - subject distance - and with
only the focal length changed between the two shots - 93mm and 244mm respectively.
You can check the EXIF.

This is not an exhaustive test - I could have used 50mm as well, but...

If you put one image over the other and scale one so that they match in subject size,
then they will show exactly the same scene.

The ~2.6X difference in the FLs used shows NO relative "foreshortening" or "compression" of
perspective of the common field of view. Ie, It DOESN'T happen!

F=93mm view...
SDIM8634-lr.jpg

F=244mm view...
SDIM8635lr.jpg