Originally Posted by angrysasquatch

It only has something to do with it if you're looking for the optimal picture quality. You brain can't process it all anyways, it more figures out what you're focused on. (ie it's hopelessly impractical)

Some quick calculations to prove my point. Say you're playing TF2, and you have it set to 90* field of view. If you've got a 1680 pixel wide display, and you turn at a rate of 2 complete turns per second, there's 13440 pixels going by a point per second. Hence, you will see the difference in FPS increases, up to 13440 FPS. You can do the calculation to prove it.

360* per full turn
90* view

therefore, 360*/90* = 4, ie. you can aim the camera at 4 different spots and not see the same object in more than one spot.

2 turns per second, 2x4 = 8, so if you move the mouse such that you're turning 2 revolutions per second, therefore you'll see 8 scenes per second

1680 pixel wide, so each scene is 1680 pixels wide. 1680 x 8 gives you 13440 horizontally panned pixels per second. Since your eyes don't operate on hertz, and technically speaking can notice any skipping, you will require 13440 FPS for absolute optimal viewing.