What is the flange focal distance for a C-mount?

The flange focal distance for a C-mount is indeed 17.526 mm. This measurement is crucial for ensuring that lenses mounted on a camera body achieve the correct focus for sharp images. A C-mount is commonly used in various applications, particularly in machine vision systems and industrial cameras, and its precise flange focal distance allows for compatibility with a range of lenses designed specifically for this mount type.

Understanding the importance of flange focal distance helps users select the appropriate lens for their camera system, ensuring optimal performance. Other distances do not align with the specifications of C-mount systems, emphasizing why 17.526 mm is the accurate choice. This distance accounts for the distance between the mounting surface (where the lens attaches) and the image sensor or film plane, which is critical for achieving the desired focus in photography and imaging applications.