Found this info, might stretch it a little.
By default BFBC2 uses a vertical Field of View (FOV) of 55 degrees. If you want to adjust this so that you can see more of the game world at any one time, you will need to do so outside of the in-game settings. Go to the \My Documents\BFBC2 directory under your personal folders, open the Settings.ini file with a text editor like Windows Notepad (first make a backup copy of it), and alter the value shown in the line Fov=55. Progressively higher values increase what you can see at one time, leading to an exaggerated fish-eye view of the world at very high values (e.g. Fov=120). Save and close this document then start the game to see the change. Note that this only affects FOV in multiplayer.