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Binocular Opera Glass
|Main Tube Length||2.6in||65mm|
|Main Tube Diameter||2.2in||55mm|
|Objective Clear Aperture Diameter||1.7in||44mm|
This pair of binoculars has curved tapered brass barrels, covered with panels of yellow-colored mother-of-pearl. The objective lenses are achromatic doublets, contained in brass cells. It has brass tubes, single eyepiece lenses, and disc-shaped eyecups, made of mother-of-pearl. The frames and all other metal parts are lightly gold-plated brass. Focusing is done with a thumbwheel.
College of Optical Sciences
The University of Arizona, 1630 East University Boulevard, Tucson, Arizona U.S.A. 85721-0094
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