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Beautiful brass lens by the talented optical engineer and photographer Jules Duboscq (1817-1886).
The lens comes with multiple aperture rings and a stopper.
Focusing is achieved thanks to a rack and pinion knob.
The back glass element is 5 cm in diameter.
The focal length is around 240 mm.
Circa 1860.
French.
Height : 8 cm, diameter of base : 6,5 cm.
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