Call it whatever you want. That extra stop makes different compared to my 70-200. It's compression under my dictionaryThere is no such thing as "lens compression" it is perspective, that is all.
What do you think the term "compression" means?Quote from: Perspective Distortion WikiPerspective distortion takes two forms: extension distortion and compression distortion, also called wide-angle distortion and long-lens or telephoto distortion, when talking about images with the same field size.
I think the term compression means "the action of being compressed", I believe compressed means "squeezed together".
I also reassert that there is no such thing as "lens compression" and the linked Wiki article is a very badly written and illustrated example of writing by committee.
If you take a shot with any lens from the same place then the perspective is the same, crop the wider angle down to the longer focal length framing and the "lens compression" is identical, ergo, there is no such thing as "lens compression". Change focal length and move to maintain subject size and you have changed your perspective, not your "lens compression".
What do you think the term "perspective" means?
Well Dylan you are introducing yet another inaccurate term, and I would be remiss if I didn't try to help.
The only thing one more stop can do is reduce your dof, that has nothing to do with "lens compression" or perspective. DOF is DOF, an 85 f1.2 has less dof than a 200 f2 at the same subject size, so does a 50 f1.8, but what a 200 f2 does give you is a unique combination of DOF and perspective.