Fastest speed, F/:
1.8 - Carl Zeiss Ultron 50/1.8
Slowest speed, F/:
2.8 - Carl Zeiss Tessar 50/2.8 and Zeiss Ikon Color-Pantar 50/2.8
Shortest closest focusing distance, m:
0.45 - Carl Zeiss Ultron 50/1.8 and Carl Zeiss Tessar 50/2.8
Longest closest focusing distance, m:
1.00 - Zeiss Ikon Color-Pantar 50/2.8
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