The Carl Zeiss Vario-Sonnar T* 28-85mm f/3.3-4 MMJ is a Japanese-manufactured Zeiss standard zoom lens for the Contax/Yashica mount system. Covering wide-angle to short telephoto in a single lens, it is one of the most versatile zooms in the Contax CY lineup. The MMJ designation identifies it as a later Japan-made variant in the MM series. The Vario-Sonnar formula applies Zeiss's Sonnar-derived optical principles to a zoom design, maintaining the contrast and rendering characteristics associated with Zeiss prime lenses across the zoom range. The 28-85mm focal range covers the most commonly used perspectives from wide environmental shots to short telephoto portrait work. The MMJ designation indicates a later production Japan-made variant, manufactured by Kyocera under Zeiss license. The.