J.Petzval (version primitive d [n° 3]
f/3,4 F=100,000 mm (30,0°) [ f/3,4 f=99,949 mm (30,0°) ]
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J.Petzval (version primitive d
Fermeture de trois diaphragmes. d=50µ Fermeture de trois diaphragmes. d=30µ |
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