FOV (Field of View) determines how much of your surrounding area you can see without turning.
Usually in FPS games where this is configurable, you adjust the horizontal field of view so you can see more to the left and right. Battlefield: Bad Company 2 uses vertical FOV instead, so it’s a little harder to work out what you need to set it to.
In order to accomplish that just use the FOV Calculator listed bellow:
Click here for the FOV Calculator
Big thanks to not available Shadow1993 for finding this little article and bringing it to my attention.