Carl Zeiss 15mm f8 Ultra wide angle lens housed in a Zeiss Ikon Contarex range camera made in 1971, also known as the Zeiss Ikon Contarex Hologon Ultrawide. It was based on the Zeiss Ikon Contarex and shares some of the accessories, such as the film spool and interchangeable backs. It also uses the same cloth focal-plane shutter and when released has the trademark Contarex sound. You change the shutter speed to adjust for correct exposure. The Carl Zeiss Hologon is a fixed-aperture, non-focusing f/8.0 15mm lens. Depth of field is from 0.5 meters to infinity, and the angle of view is 110 degrees.