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Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Optical systems that feature multiple image planes are at risk of a potential problem, which involves the inability on the part of succeeding relay lenses to capture a cone of light from the primary objective lens. [4] The field lens - by behaving as a variably angled lens - solves this problem by bending or refracting the cone of light back ...
Typically objective lenses on early sights are smaller than modern sights, in these examples the 4×81 would have an objective 36 mm diameter and the 2.5×70 should be approximately 21 mm (relative luminosity is the square of the exit pupil as measured in mm; a 36 mm objective lens diameter divided by the 4× magnification gives an exit pupil ...
One could rightly conclude that the resolution of a confocal microscope is superior to that of a wide-field microscope in all three dimensions. A three-dimensional optical transfer function can be calculated as the three-dimensional Fourier transform of the 3D point-spread function.
Litening is an integrated targeting pod that mounts externally to the aircraft. The targeting pod contains a high-resolution, forward-looking infrared (FLIR) sensor that displays an infrared image of the target to the aircrew; it has a wide field of view search capability and a narrow field of view acquisition/targeting capability of battlefield-sized targets.
The M21 sniper weapon system (SWS) in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle. [7] The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle. [8]
The PU-21 (Russian: ПУ-21 Пулемёт с унифицированной подачей) is a 5.45×39mm machine gun designed by V. M. Kalashnikov and M. E. Dragunov between 1972 and 1977. The PU-21 can be fed from either a 45-round magazine or a 200-round belt. The PU-21's sights are graduated to distance of 1,000 metres (3,300 ft). [1] [2]
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