Collection Home > Telescopes > Twin Telescopes > French Twin Telescopes
French Twin Telescopes
|Main Tube Length||4.5in||113mm|
|Objective Clear Aperture Diameter||.9in||22mm|
This interesting pair of binoculars has two-part aluminum barrels. The short forward sections are parallel and the rear sections are tapered. The tapered barrel sections and the extendable brass shades are covered in brown leather. The objective lenses are achromatic doublets, contained in brass cells. It has aluminum eyepiece tubes, very rare and unusual five lens eyepieces, and solid brass eyecups. The uncommon fluted solid brass fittings at the rear of the barrels serve as guides and bearing surfaces for the eyepiece tubes. The brass frame is hinged, so that the user can adjust for the distance between the eyes. A thumb nut allows the frame position to be locked. Focusing is done with a central thumbwheel, made of gutta percha. It is marked "ANASTIGMAT" and "22 VERRES" on the frame crosspiece nearest the eye cups. It is not signed by the maker.
College of Optical Sciences
The University of Arizona, 1630 East University Boulevard, Tucson, Arizona U.S.A. 85721-0094
All contents copyright © 2008 Arizona Board of Regents.