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Inv.
2589 V.21 Objective lens End of the seventeenth century Unsigned Glass, wood, cardboard Diameter 190 mm |
Description A large biconvex objective lens mounted in a wooden ring covered with cardboard. The diameter of the lens alone is 165 mm, the aperture 146 mm, the focal length 13.1 m. The glass shows a slight green tint and has elliptical inclusions and bubbles. |
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