I'm so glad I've found the primary source of this diagram explaining the relationship between focal length and field of view, with a clear diagram and some exam

I'm so glad I've found the primary source of this diagram explaining the relationship between focal length and field of view, with a clear diagram and some example pictures: https://av.jpn.support.panasonic.com/support/global/cs/dsc/knowhow/knowhow12.html https://av.jpn.support.panasonic.com/support/global/cs/dsc/k...