Above are premium wide-angle UVC compatible group videoconferencing solutions for cross-platform environments.
Of note: Logitech's BCC950 and C3000e offer mechanical PTZ - Pan, Tilt and Zoom functions via remote - as well as integrated microphones and speakerphone capabilities.
More recent cameras with Hardware-Based Autofocus have improved greatly with more responsive and smoother adjustments.
Logitech excels with very rapid autofocus response in many of it's newest generation of 720p and 1080p HD web cameras.
USB Video Class - Universal USB webcams are now the de-facto camera standard, the SMART choice for getting online and connected to pals, family and friends with the least amount of hassle and cross-platform compatibility.