Orthographic (I believe) doesnt use lighting and possibly not even post processing as its made for 2d style games.
I may be wrong so please dont quote me.
I cheated my way passed this , well sort of
I needed a side on camera but didnt want the other faces showing when i moved the camera. I managed to get it to work but its not perfect.
To do this i set the camera FOV to around 10° but i had to then move my camera and background elements to try compensate, and it seem to work pretty well.
Its not perfect tho, hope it helps you