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Eustachio Divini, Biconcave eyepiece lens

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Eustachio Divini (1610-1685)
Biconcave eyepiece lens, Rome, 1666
Florence, Istituto e Museo di Storia della Scienza, inv. 2574

Signed and dated eyepiece for a telescope with an objective of approximately 5.8 metres in focal length, consisting of a biconcave lens.