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  2. Eye relief - Wikipedia

    en.wikipedia.org/wiki/Eye_relief

    Optics showing eye relief and exit pupil 1 Real image 2 Field diaphragm 3 Eye relief 4 Exit pupil. Eye relief distance can be particularly important for eyeglass wearers and shooters. The eye of an eyeglass wearer is typically further from the eyepiece, so that user needs a longer eye relief in order to still see the entire field of view.

  3. Glossary of firearms terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_firearms_terms

    Eye relief: For optics such as binoculars or a rifle scope, eye relief is the distance from the eyepiece to the viewer's eye that matches the eyepiece exit pupil to the eye's entrance pupil. Short eye relief requires the observer to press their eye close to the eyepiece in order to see an un-vignetted image. For a shooter, eye relief is an ...

  4. C79 optical sight - Wikipedia

    en.wikipedia.org/wiki/C79_optical_sight

    After reviewing feedback from the soldiers who used the sight, Elcan produced the fourth generation mount C79, known as the C79A2, and is mounted onto the C7A2 rifle, as well as the C8A3 carbines. The C79A2 sight is a component of the C7A2 mid-life update program of the Canadian Forces' inventory of C7A1 rifle systems.

  5. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    The longer the focal length of the eyepiece, the greater the eye relief. Typical telescopic sights may have eye relief ranging from 25 mm (0.98 in) to over 100 mm (3.9 in), but telescopic sights intended for scout rifles or handguns need much longer eye relief to present a

  6. Red dot sight - Wikipedia

    en.wikipedia.org/wiki/Red_dot_sight

    The mount is compact enough to be used on pistols, as well as rifles and shotguns. The dovetail is approximately 16.5 mm wide, and is radiused so as not to have any sharp edges. Also used on Aimpoint Acro C-2 and P-2, as well as Steiner MPS, Viridian RFX 45, CH Duty, Lucid Optics E7 [18] and Vector Frenzy Plus. Aimpoint Micro standard

  7. Diopter sight - Wikipedia

    en.wikipedia.org/wiki/Diopter_sight

    Target shooting diopter of a 10 metre air rifle with a mounted semi-transparent occluder for the non-aiming eye. A diopter sight is an aperture sight component used to assist the aiming of ranged weapons, mainly firearms, airguns, and crossbows. Diopters function to precisely align the shooter's eye with the front sight and the target, while ...

  8. Specter (sight) - Wikipedia

    en.wikipedia.org/wiki/Specter_(sight)

    The optic is fitted to the rifle with A.R.M.S. locking levers to a normal Picatinny rail (MIL-STD 1913 rail) 70 mm (2.8 in) from the shooter eye. The optic is zeroed at 100 m (109 yd) range the azimuth/windage is adjusted in ½ MOA increments by flathead screwdriver on the front right of the optic and the elevation is adjusted in ½ MOA ...

  9. Exit pupil - Wikipedia

    en.wikipedia.org/wiki/Exit_pupil

    The optimum eye relief distance also varies with application. For example, a rifle scope needs a very long eye relief to prevent recoil from causing it to strike the observer. [1] The exit pupil can be visualized by focusing the instrument on a bright, nondescript field, and holding a white card up to the eyepiece.