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Objective lens
Terrestrial telescope
Objective lens

Inv. 2590
V.20 Objective lens
End of the seventeenth century
Diameter 173 mm


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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