Marshall Electronics 5500 Series 5MP VIS-IR Corrected Lenses

Marshall's 5500 series lenses are VIS-IR corrected, meaning they hold focus across both visible and infrared wavelengths so a day/night camera doesn't need to refocus when it switches to IR illumination at night. All five variants share an F2.0 aperture and a 5-megapixel rating, matched to Marshall's 5MP board and board-color camera line.

The series covers three focal lengths (3.9mm, 5.0mm and 7.6mm) in two mount styles: M12 for board cameras, and 1/2-inch CS-mount for cased cameras taking a standard CS lens. Pick the focal length for field of view and the mount to match the camera body.