In my case, the "lens" is a microscope objective and a long tube, but I've also tested it as a webcam.

Arducam has a bunch of C-mount lenses, https://www.amazon.com/stores/page/35052708-55DC-4832-A0B6-A... as well as nice USB webcams that let you choose from several sensors. https://www.arducam.com/sony/imx477/