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  2. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    The most commonly encountered mounting systems are the 3 ⁄ 8 inch (9.5 mm) and the 11 mm dovetail rails (sometimes called "tip-off mounts") commonly found on rimfires and air guns, the Weaver rails, the mil-spec MIL-STD-1913 Picatinny rail (STANAG 2324), and the NATO Accessory Rail (STANAG 4694). Ruger uses a proprietary scope base system ...

  3. Schmidt & Bender - Wikipedia

    en.wikipedia.org/wiki/Schmidt_&_Bender

    The Convex rail uses matching slide-in mount fasteners to connect the riflescope to the gun and offers the possibility to tilt the scope up to 1° to the left or right. Since 2017 [ 12 ] Schmidt & Bender also offer the Zeiss rail system on some of their hunting telescopic sights in the following series: Exos, Polar T96 and Stratos.

  4. Hubble Space Telescope - Wikipedia

    en.wikipedia.org/wiki/Hubble_Space_Telescope

    The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.

  5. Shoe-fitting fluoroscope - Wikipedia

    en.wikipedia.org/wiki/Shoe-fitting_fluoroscope

    A shoe-fitting fluoroscope was a metal construction covered in finished wood, approximately 4 feet (1.2 m) high in the shape of short column, with a ledge with an opening through which the standing customer (adult or child) would put their feet and look through a viewing porthole at the top of the fluoroscope down at the X-ray view of the feet ...

  6. Lens mount - Wikipedia

    en.wikipedia.org/wiki/Lens_mount

    N/A. Screw mount must be adjusted manually for back focus. Back focal distance from <1mm to 12mm. 1/6" to 1" 12 mm 0.5 mm pitch Screw CCTV, PCB: Edmund Optics μ-Video Bolex Bajonet 23.22 mm 16 mm: Breech lock Cinematography effective focal distance 17.526 mm (0.69 inches) due to beam splitter behind mount flange (accepts C-mount lenses with ...

  7. M42 lens mount - Wikipedia

    en.wikipedia.org/wiki/M42_lens_mount

    The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.

  8. M1903 Springfield - Wikipedia

    en.wikipedia.org/wiki/M1903_Springfield

    The Redfield scope mount removed the rear peep sight that was standard on the M1903A3. The scope used on the M1903A4 was a Weaver Model 330 or 330C, which was a 2.75x telescopic sight. The receivers were tested by Remington Arms and those that were deemed best, meaning those closest to design specifications were selected to become M1903A4s.

  9. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]

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