M17, 7x50 Observation Binoculars: This is a slightly used pair of US Army Mark 17 observation binoculars, dating from around 1944-45. Very large binocular naval rangefinders (up to 15 meters separation of the two objective lenses, weight 10 tons, for ranging World War II naval gun targets 25 km away) have been used, although late-20th century technology made this application mostly redundant. Modern binoculars designed for military usage can also feature laser rangefinders, compasses, and data exchange interfaces to send measurements to other peripheral devices. Further, binoculars designed for military usage may include a stadiametric reticle in one eyepiece in order to facilitate range estimation.
Military binoculars of the Cold War era were sometimes fitted with passive sensors that detected active IR emissions, while modern ones usually are fitted with filters blocking laser beams used as weapons. Military binoculars can and were also used as measuring and aiming devices, and can feature filters and (illuminated) reticles. It projected only a few inches above the parapet, thus keeping the viewer's head safely in the trench. One variant form was called "trench binoculars", a combination of binoculars and periscope, often used for artillery spotting purposes. Prism sets in military binoculars may have redundant aluminized coatings on their prism sets to guarantee they don't lose their reflective qualities if they get wet. They generally avoid fragile center focus arrangements in favor of independent focus, which also makes for easier, more effective weatherproofing. Binoculars constructed for general military use tend to be more rugged than their civilian counterparts. Galilean designs were widely used up to the end of the 19th century when they gave way to Porro prism types. Binoculars have a long history of military use. Original Items: Only One Lot of 2 Available.
0 kommentar(er)
