Actually the camera angle is quite severely against the Purple Team. When you are the Blue Team starting off.. you can see much farther "up map" because of the camera angle. When you are Purple however, the camera angle is basically working against the direction you are usually looking.
When I am on the Blue Team and have the camera centered on my hero.. I can see the edge of the "fog of war" visibility line just fine, when looking towards the enemy side. When I'm Purple, I've got about 3 minions worth of space that I'm missing before the "fog of war" line even starts. So I've GOT to play UNLOCKED CAMERA and not have it centered on my Champ if I'm Purple in order to see as far as the opponents.. but that means that I've got the camera scooted farther "down" from my Champ.. so I end up seeing less of the mapspace BEHIND my Champ.
They should honestly just rotate the map for Purple so they play from the same perspective as Blue, it's just on a spun around map. SIMPLE fix.