I am just starting building up an interesting isometric game. As an Unity3D beginner, I want to collbrate some important components information while I am learning. This blog listed most frequent used elements in Unity3D camera.
Objection:
perspective: Camera will render objects with perspective intact. It will look into both visible and invisible objects in 3D.
orthographic: Camera will render objects uniformly, with no sense of perspective. It will look into only visible objects. The camera itself is like a plane. If you want to build 2.5D game, or isometric game, you can set camera orthographic.