Most webcams use simple plastic aspheric lenses. The QuickCam Pro 9000 used a – a 4-element, 3-group lens design patented in 1902. In a webcam context (2008–2012), this was revolutionary.
Open Logitech Webcam Software (installed from the package). If you see live video and can adjust focus, success! logitech carl zeiss tessar 2.0 3.7 driver
The original driver (version 13.80.854.0 for Windows 7/8) unlocked features lost in later “universal” drivers: Most webcams use simple plastic aspheric lenses