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Inv.
2594 V.11 Eyepiece lens 1640-1660 Unsigned Glass, wood, cardboard Diameter 41 mm |
Description Plano-concave eyepiece lens mounted in a wooden ring covered with cardboard. The diameter of the lens is 26 mm, the focal length -140 mm (the negative focal length means that the lens is diverging). The glass has a good transparency, in spite of some elliptical bubbles. On the ring is the inscription "B: 10. Bu: [?]", which seems to suggest the combination of this eyepiece with a 10 braccia objective (corresponding to 5840 mm). This lens, of Florentine origin, as indicated by the measure in braccia, can be dated to between 1640 and 1660. |
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