Collecting Military Binoculars
Bausch & Lomb 10 x 40 Custom 1990's
No: AA 2234
Bausch & Lomb 10X40 w/ National Audubon Society and the Blue Heron logo. New armoured version. BAK-4 prisms and image is very sharp, almost all the way across its 5.2 degree FOV. These are what some call inverted prisms since the objectives are lower than the eyepieces.