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Both, actually.

• rozab 1y ago
  Well, no. This article has some clarifications: https://petapixel.com/is-lens-compression-fact-or-fiction/ https://petapixel.com/is-lens-compression-fact-or-fiction/
• _aavaa_ 1y ago
  It’s entirely independent of focal length. It has to do with the ratio of the subject-camera distance to the background-camera distance. As others have pointed out you prove this to yourself in one of two ways: 1. Frame with telephoto, then shoot with a wide angle lens and digitally zoom in photo. 2. Frame with wide angle and then shoot a panorama with the telephone and stich. 2 is significantly harder if you are close to the subject.