Quote Originally Posted by iND View Post
Is the focus point the only determinate of the distance, which in the case of the 5D3 is the central focus point 100% of the time, and does the metering mode come into play. ( I know this answer may be different with 1Dx models).
Why do you say it's always the center point on 5D3? There are 61 points, and you can use them in many different ways ("it slices, it dices..."). If multiple points are eligible, the camera selects the closest reading as final, and asks the lens to hit that.

How that aligns with metering mode and flash/TTL metering mode is beyond me though...