I read the five C's of cinematography as well. This is what the author says in few words:
1. OBJECTIVE: Viewer/camera is out of the action but it's a witness.
2. P.O.V.: Viewer/camera is part of the action PLUS viewer/camera is positioned close to a character.
3. SUBJECTIVE: Viewer/camera is part of the action PLUS viewer/camera IS the character's eyes.
Hope it clarifies easy & fast what the difference is.
:-)