Built-in light on the sensor from the images in normal lighting causing the framerate to 15 frames per second too.
Tested 640x480 and a black jacket, reddened face, the frame rate of 15 frames a second. Hold a white sheet of paper and go frame 30 frames per second and the picture darkens.
Blow picture (face) in normal room lighting with built-in light sensor overexposure useless webcam makes for the company Logitech QuickCam Vision Pro for Mac costs associated with the object.
I checked on the MacPro and MacMini Snow Leopard Leopard, and use Skype, iChatAV, Wirecast, ScreenFlow into two different rooms, two VisionPros. The results are consistently bad, as I mentioned above.