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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 chart was designed by Ian Bailey [5] and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. [1] [3] They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...
35 mm widescreen aspect ratio used by The Metro Goldwyn Mayer Company and The Warner Brothers Company from 1953 to 1955 and since abandoned and The Walt Disney Company has cropped the old classic post-1950s 1.33:1 fullscreen films to the 1.75:1 widescreen aspect ratio of their DVDs including The Jungle Book. 1.77:1 = 16:9 = 4 2:3 2
The resolution of 960H depends on whether the equipment is PAL or NTSC based: 960H represents 960 x 576 (PAL) or 960 x 480 (NTSC) pixels. [29] 960H represents an increase in pixels of some 30% over standard D1 resolution, which is 720 x 576 pixels (PAL), or 720 x 480 pixels (NTSC). The increased resolution over D1 comes as a result of a longer ...
5.56×45mm NATO – standard ammunition size; 6 mm – approximate width of a pencil; 7 mm – length of a Paedophryne amauensis, the smallest-known vertebrate [96] 7.1 mm – length of a sunflower seed; 7.62×51mm NATO – common military ammunition size [97] 8 mm – width of old-format home movie film
Dots per inch. A close-up of the dots produced by an inkjet printer at draft quality. Actual size is approximately 1⁄4 by 1⁄4 inch (6 by 6 mm). Individual coloured droplets of ink are visible; this sample is about 150 DPI. Dots per inch (DPI, or dpi[1]) is a measure of spatial printing, video or image scanner dot density, in particular the ...