Ludwig Bertele

Biography

Ludwig Bertele was a German optical designer best known for the high-speed Sonnar and wide-angle Biogon lens families. His compact Sonnar designs combined large apertures with relatively few air-to-glass surfaces, reducing flare before antireflection coatings became common. He later advanced the nearly symmetrical Biogon, whose broad field and strong corner definition made it a landmark design for rangefinder, medium-format, and technical cameras.

Sources: ZEISS — The unique history of the Otus lens family · ZEISS — Distagon, Biogon, Hologon

Zeiss Ikon AG(3)

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