Minolta's first super-wide angle lens for the SR-mount SLR cameras required the mirror to be locked up, allowing the lens to protrude deep inside the camera body. In general construction and specification (9 elements, 5 groups) it closely matches the contemporary Zeiss Biogon designed by Ludwig Bertele in 1951
<a href="//commons.wikimedia.org/wiki/User:Mliu92" title="User:Mliu92">Mliu92</a>
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