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Aluminum Twin Telescopes
|Main Tube Length||3.7in||93mm|
|Objective Clear Aperture Diameter||1.18in||30mm|
This pair of binoculars has parallel aluminum barrels, covered with brown leather. The objective lenses are achromatic doublets, contained in aluminum cells. It has aluminum eyepiece tubes, four lens eyepieces, and flared eyecups. The thumbwheel with its axel perpendicular to the barrels adjusts the barrels' spacing, to adjust for different eye separation. The other thumbwheel, whose axel runs parallel to the barrels, is used for focusing. The objective lenses have extendable sunshades, which are covered in leather. The face of the left eyecup is marked "ADJUSTED IN LONDON" and the right eyecup is marked "NEGRETTI & ZAMBRA OPTICIANS TO THE QUEEN." The binoculars have a fitted leather case. The inside of the leather lid is marked "NEGRETTI & ZAMBRA OPTICIANS To Her Majesty 45 CORNHILL 122 REGENT ST. LONDON."
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