The Carl Zeiss Distagon T* 28mm f/2.8 MMJ is a Japanese-manufactured Zeiss wide-angle lens for the Contax/Yashica mount system. The MMJ designation identifies it as a later Japan-made variant in the MM series, incorporating improvements to coating and mechanical refinements over the earlier AEJ generation. The T* (T-star) coating is Zeiss's proprietary multi-layer anti-reflection coating applied to all air-to-glass surfaces. It suppresses flare and ghosting effectively while maintaining the high contrast and color accuracy associated with Zeiss optics — particularly important for a wide-angle lens frequently used against bright skies and light sources. The MMJ designation indicates a later production Japan-made variant, manufactured by Kyocera under Zeiss license. The MM series introduc.
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