Description: The Zenzanon PS 40mm f/4 is the widest rectilinear lens available for the SQ series. This lens is ideal for interiors, architecture and landscapes, as well as shooting large groups and unique portraits. Zenzanon PS interchangeable lenses were all developed specifically for the SQ series cameras, employing computer-aided optical design and multi-coating technology. PS lenses are equipped with a shutter that opens and closes at a signal from the camera body. Shutter speeds are available from 1/500th of a second to 16 seconds. PS lenses must be mounted with the shutter cocked.