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Inv.
2590 V.20 Objective lens End of the seventeenth century Unsigned Glass Diameter 173 mm |
Description A large biconvex objective lens, of a focal length greater than 50 m. The diameter is 173 mm, the thickness 3 mm. The glass, very scratched, has a slight green tint; moreover, it shows various bubbles and some elliptical inclusions. |
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