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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. It is widely used in optical engineering laboratory work to analyze and ...
The most common size category. For women of about average height (5 ft 4 in) with an average bust height and an hourglass figure. Dress sizes may be given as girth at the bust in inches (e.g., 36), but even-numbered sizes from 2 to 16 are more common. Categorical sizes range from XS (extra-small) to XL (extra-large).
Shooting target. A "splatter"-type paper target — 25 shots at a distance of 91 metres (100 yd), all hitting inside the bullseye within a 25 millimetres (1 in) grouping. An electronic scoreboard used for stangskyting in Norway in 2007 showing the number of hits for each shooter after the first half. Shooting targets are objects in various ...
Point-blank range is any distance over which a certain firearm or gun can hit a target without the need to elevate the barrel to compensate for bullet drop, i.e. the gun can be pointed horizontally at the target. [1] [2] For targets beyond-blank range, the shooter will have to point the barrel of their firearm at a position above the target ...
Target archery is the most popular form of archery, in which members shoot at stationary circular targets at varying distances. All types of bow – longbow, barebow, recurve and compound – can be used. In Great Britain, imperial rounds, measured in yards, are still used for many tournaments and these have slightly different rules to metric ...
NBS 1952 target. The NBS 1952 target is a 3 bar pattern (long bars). The spatial frequency is printed alongside each triple bar set, so the limiting resolution may be determined by inspection. This frequency is normally only as marked after the chart has been reduced in size (typically 25 times).