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  2. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    225 mm 2 area Four Thirds System format from Olympus (crop factor 2.0) 116 mm 2 area 1" Nikon CX format used in Nikon 1 series [17] and Samsung mini-NX series (crop factor 2.7) 43 mm 2 area 1/1.7" Pentax Q7 (4.55 crop factor) 30 mm 2 area 1/2.3" original Pentax Q (5.6 crop factor). Current Q-series cameras have a crop factor of 4.55.

  3. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  4. Optical format - Wikipedia

    en.wikipedia.org/wiki/Optical_format

    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 ...

  5. Crop factor - Wikipedia

    en.wikipedia.org/wiki/Crop_factor

    The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question; that is, = /. Given the same 3:2 aspect ratio as 35mm's 36 mm × 24 mm area, this is equivalent to the ratio of heights or ratio of widths; the ratio of sensor areas is the square of the crop factor.

  6. C mount - Wikipedia

    en.wikipedia.org/wiki/C_mount

    For example, for the 4/3 format, a 12 mm lens is a wide-angle lens and will have a retrofocus design. For the 2/3-inch format, a 12 mm lens is "normal" and can have a simple and fast double Gauss layout. For the 1/3-inch format, a 12 mm lens is long and can have a telephoto design.

  7. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    The Paris point equates to 23 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 ...

  8. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as ⁠2 + 3 / 8 ⁠ ″ and not as 2.375″ nor as ⁠2 + 6 / 16 ⁠ ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been ...

  9. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    686 mm: 2 ft 3 in: See List of 2 ft 3 in gauge railways: 693 mm: 2 ft 3 + 9 ⁄ 32 in: Sweden: 28 Swedish inches. [28] Several railways. 700 mm 2 ft 3 + 9 ⁄ 16 in: Denmark See Narrow-gauge railways in Denmark and Narrow-gauge railways in Europe. Common for sugar beet or sugar cane railways and peat railways. Hedeland veteran railway is ...