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The development of the 'Tessar' lens is discussed by Nasse, [11] and shows its transformation from an f /6.3 lens for plate cameras using the original three-group configuration through to an f /2.8 5.2 mm four-element optic with eight extremely aspheric surfaces, economically manufacturable because of its small size. Its performance is 'better ...
Sulitjelma Line converted from 750 mm (2 ft 5 + 1 ⁄ 2 in) to dual gauge with 1,067 mm (3 ft 6 in) and when later closed was converted to a road. 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in ) 1,067 mm ( 3 ft 6 in )
The optical format is approximately the diagonal length of the sensor multiplied by 3/2. The result is expressed in inches and is usually (but not always) rounded to a convenient fraction. For instance, a 6.4x4.8 mm sensor has a diagonal of 8.0 mm and therefore an optical format of 8.0*3/2 = 12 mm, which is expressed as 1 ⁄ 2 inch in imperial ...
The Paris point equates to 2 ⁄ 3 centimetre (6.67 mm; 0.26 in). Whole sizes are incremented by 1 Paris point; this corresponds to 3.33 millimetres (0.131 in) between half sizes. This unit is commonly used in Continental Europe, and Russia and former USSR countries. The barleycorn is an old English unit that equates to 1 ⁄ 3 inch (8.47 mm ...
However, the 3 + 1 ⁄ 2-inch (89 mm) 12-gauge shell, with its higher SAAMI pressure rating of 14,000 psi (97 MPa) compared to standard 2 + 3 ⁄ 4-inch (70 mm) and 3-inch (76 mm) 12-gauge shells with their lower pressure rating of 11,500 psi (79 MPa), began to approach the performance of the 3 + 1 ⁄ 2-inch (89 mm) 10-gauge shells with a ...
mm 2: US spelling: square millimeter: 1. ... conversion combination output units Metric: kilogram per cubic metre: ... 1.0 cu ft (0.028 m 3) cubic inch: cuin cu in 1. ...
In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1 ⁄ 4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...