Why buy an industrial F-mount lens?
In high-end machine vision applications, cameras with F-mount are often used. An F-mount lens has a much larger diameter than a C-mount lens. The result is that an F-mount lens can illuminate a larger sensor than a C-mount lens. C-mount lenses can illuminate up to 4/3 inch sensors, while an F-mount lens can illuminate 35mm sensors. If we translate the sensor sizes into diameters, also called image circle, then a C-mount lens has a maximum image circle of 21.5mm (4/3 ”sensor), while an f-mount lens has a minimum image circle of 43mm (suitable for 35mm sensors). The image circle of the F-mount lens is twice as large, which is why the F-mount lens is suitable for very large image sensors.