(On the older lenses, also called AE lenses, it is marked in white.) The newer MM lenses are still backwards-compatible with all Contax and Yashica cameras, but with older AE lenses one cannot use all available programmed and shutter-priority exposure functions on the post-1984 Contax bodies. The new MM lenses are distinguished visually by the color of the f-stop markers: the highest f-stop on the MM lenses is marked in green. The C/Y mount was slightly modified in 1985 with the new Zeiss 'MM' design lenses, which permitted the use of program and shutter-priority on the Contax 159MM and subsequent bodies. In 1983, Kyocera acquired Yashica, and continued to manufacture Yashica ML lenses, as well as the Carl Zeiss AE T* lenses under license. But all of these lenses were interchangeable with any Yashica or Contax camera equipped with the C/Y bayonet lens mount. Some Carl Zeiss lenses were made in Germany and the rest in Japan under Zeiss license. ![]() The top of the line was the renowned Zeiss AE series of lenses, intended for the Contax SLR cameras, each of which displayed a T* for Zeiss' proprietary multi-coating. The Yashica range of lenses included a premium range of lenses for the more serious photographer (termed 'ML' for multi-layered or 'MC' for multi-coating), while consumer SLR cameras were usually equipped with 'DSB' lenses, which had single-coated optics. Contax/ Yashica (C/Y) manual-focus lenses with a common bayonet mount were introduced in 1975 simultaneously on the Contax RTS and on the Yashica FX-1.
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