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V.20 Objective lens
Maker: unknown
Date:late 17th cent.
Materials:glass
Dimensions:diameter 173 mm
Current inventory:2590
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Large biconvex objective lens with a focal length exceeding 50 m. The diameter is 173 mm, the thickness 3 mm. The glass has a slight green tint; it is heavily scratched and contains bubbles and elliptical inclusions.

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