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Binocular Opera Glass

Signature LeMaire Fabi,   Paris

Date Mid 1800s
Dimensions English Metric
Main Tube Length 2.0in 51mm
Main Tube Diameter 1.7in 43mm
Total Length 3.4in 85mm
Closed Length 2.6in 66mm
Inter-Pupilary Distance 2.4in 61mm
Objective Clear Aperture Diameter 1.2in 31mm

Description

This pair of opera glasses has curved tapering aluminum barrels, covered with panels of brownish-colored mother-of-pearl.  The objective lenses are achromatic triplets, contained in aluminum cells.  It has aluminum tubes, triplet eyepiece lenses, and flared eyecups, made of segments of mother-of-pearl.  The frames and all other metal parts are made of aluminum, which was considered very valuable at the time.  Focusing is done with a thumbwheel, also made of mother of pearl.  Inscribed on the aluminum cross piece nearest the eyecups is "12 lenses," referring to the total number of lenses, 4 times three triplets.  It is signed "LeMaire Fabi   Paris" on the face of both eyecups.

 


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