Sight Control is a simple and user-friendly OS X application that will give you total control of your Mac’s built-in webcam.
Sight Control will automatically identify Mac's built-in webcams, including Built-in iSight, Display iSight, FaceTime Camera (Built-in), FaceTime Camera (Display), FaceTime HD Camera (Built-in) and FaceTime HD Camera (Display).
Sight Control communicates with Mac’s built-in webcams and learns what settings they can support.
You can adjust all these settings
Auto-Exposure Mode
Exposure Time
Gain
Aperture
Brightness
Contrast
Hue
Saturation
Sharpness
Gamma
White Balance Temperature
Power Line Frequency
Backlight Composition