Petri Flex 7
The Petri Flex 7 is a single lens reflex camera introduced by Petri in 1964 and is claimed to be the worldâs first SLR with a fully integrated cadmium sulfide light meter. Known by many as âthe poor manâs Contarexâ for its superficial (and most likely intentional) resemblance to the Zeiss Ikon Contarex âBullseyeâ, the Flex 7 was marketed as Petriâs flagship model and was supposedly meant to compete with the nigh untouchable Nikon F. Advertisements put special emphasis on the cameraâs auto-indexing feature (meaning that the lensâs aperture setting would be automatically relayed to the body), the fact that its integrated light meter had an in-viewfinder indicator, and how Petriâs mastery of mass production meant high quality cameras at low prices.