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Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military ...
SWAROVSKI OPTIK, headquartered in Absam, Tyrol, Austria is part of the Swarovski group of companies. Founded in 1949, the Austrian company specialises in the development and manufacturing of long-range optical instruments in the premium segment of the market, including binoculars, telescopes (spotting scopes), rifle scopes, range finders and night sight devices.
Galilean type Soviet-made miniature 2.5 × 17.5 monocular Diagram of a monocular using a Schmidt-Pechan prism: 1 – Objective lens 2 – Schmidt-Pechan prism 3 – Eyepiece. A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead of using relay lenses like most telescopic sights.
Charts for vision - •Distant vision: to determine visual acuity of distant vision ••Snellen's distant vision chart-do-; for those who can read in English ••Regional language charts-do-; for those who can read in their local language ••E Chart-do-; for those who can not read ••Landolt's broken ring chart-do-; for those who can ...
Since the strength of the visual distortion is subject to individual variation, [2] observers perceive the globe effect with varying intensity or not at all. A regular grid, as shown in Fig. 2b, is only visible as long as the observer's gaze remains fixed on the center of the field of view (cross), otherwise the bent lines of the pincushion ...
Mildot chart as used by snipers. Angle can be used for either calculating target size or range if one of them is known. Where the range is known the angle will give the size, where the size is known then the range is given. When out in the field angle can be measured approximately by using calibrated optics or roughly using one's fingers and hands.