You should download the Camera Mod by Sergbuto.
http://www.subsim.com/radioroom/showthread.php?t=122690
FEATURES:
Free Camera
- narrower angle (for better sense of scale and less distortion at screen edges)
- finer rotation control
- faster movement speed with "shift"
- height limit increased to 2000m (from only 70 before!)
Follow Object Camera
-slightly narrower angle
Conning Deck Camera
-no more small downward limit! (you can look down to the floor if you want to now)
-a much more "3D" camera, thanks to shifting it a little off the center of rotation
Crew Position Cameras and Captain's Bed
-no more rotation limits (except upside down)
-a more "3D" camera