The lens designation "Tessar" refers to a patented optical design originally developed by Paul Rudolph at Carl Zeiss in 1902. Renowned for its relatively simple four-element design in three groups, the Tessar is famous for providing high definition and contrast while remaining compact.
The "3.7" marking refers to the focal length of the lens in millimeters. In the context of small sensor sizes found in webcams (often 1/4-inch to 1/2.8-inch sensors), a 3.7mm focal length provides a wide field of view. logitech carl zeiss tessar 2.0 3.7 driver
This specific lens engraving appears on two primary Logitech webcam models from the late 2000s to early 2010s: The lens designation "Tessar" refers to a patented
Note: The very similar “Logitech Carl Zeiss Tessar 2.0/4.0” appears on the Logitech C910 and C920. Note: The very similar “Logitech Carl Zeiss Tessar 2
The Tessar is well-corrected, but at f/2.0, purple fringing appears on high-contrast edges. Logitech’s driver applied real-time C.A. reduction – very advanced for 2008.
To utilize the full capabilities of the Tessar lens (specifically the autofocus algorithms and low-light correction), specific Logitech driver extensions or utility software are often required. This software controls: