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  2. Reticle - Wikipedia

    en.wikipedia.org/wiki/Reticle

    Reticle accessory (PD-8) used in sniper rifles. A reticle, or reticule[1][2] also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight, spotting scope, theodolite, optical microscope or the screen of an oscilloscope, to provide measurement references during visual ...

  3. Pentax 6×7 - Wikipedia

    en.wikipedia.org/wiki/Pentax_6×7

    Pentax 6×7 side. Pentax 6×7 back. The Pentax 6×7 (called "Pentax 67" after 1990) is a SLR medium format system film camera for 120 and 220 film, which produces images on the film that are nominally 6 cm by 7 cm in size (actual image on the film is 56 mm × 70 mm), made by Pentax. It originally debuted in 1965 as a prototype dubbed the Pentax ...

  4. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    With a mrad reticle-equipped scope the distance to an object can be estimated with a fair degree of accuracy by a trained user by determining how many milliradians an object of known size subtends. Once the distance is known, the drop of the bullet at that range (see external ballistics ), converted back into milliradians, can be used to adjust ...

  5. Pentax cameras - Wikipedia

    en.wikipedia.org/wiki/Pentax_cameras

    A review by Imaging Resource emphasised its "excellent high ISO performance" and "excellent print quality". [26] In September 2010 Pentax announced the K-r, a 6 frames per second 12.4 megapixel camera [27] and the K-5, a 7 frames per second 16.3 megapixel camera. [28] These cameras use a new, faster autofocus system, SAFOX IX. [29]

  6. Pentax (lens) - Wikipedia

    en.wikipedia.org/wiki/Pentax_(lens)

    2000: Pentax develops and commercializes the world's first diffractive DVD/CD-compatible hybrid pickup lens. [1] 2009: Pentax introduces the world’s first autofocus fisheye lens. That lens is the DA 10-17mm ED (IF) Fish-Eye. [1] 2011: Pentax introduces the world’s smallest and lightest interchangeable lens camera (ILC). That camera was the ...

  7. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...

  8. 7.92×33mm Kurz - Wikipedia

    en.wikipedia.org/wiki/7.92×33mm_Kurz

    The 7.92×33mm Kurz has a 2.22 ml (34.3 grain H 2 O) cartridge case capacity.. 7.92×33mm Kurz maximum C.I.P. cartridge dimensions.All sizes in millimeters (mm). Americans define the shoulder angle at alpha/2 ≈ 17.5 degrees. The common rifling twist rate for this cartridge is 240 mm (1 in 9.45 in), four grooves, Ø lands = 7.89 millimetres (0.311 in), Ø grooves = 8.20 millimetres (0.323 in ...

  9. MNREAD acuity chart - Wikipedia

    en.wikipedia.org/wiki/MNREAD_acuity_chart

    The MNREAD acuity chart or Minnesota low vision reading chart is a text based chart used to measure near visual acuity in people with normal or low vision. [1] It can also be used to measure maximum reading speed, critical print size and the reading accessibility index of a person. [2] Digital and printed types of charts are available.

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