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The eye relief of an optical instrument (such as a telescope, a microscope, or binoculars) is the distance from the last surface of an eyepiece within which the user's eye can obtain the full viewing angle. If a viewer's eye is outside this distance, a reduced field of view will be obtained.
Problems were the scope's extreme eye relief, poor functioning in bad light and low magnifying power. Nonetheless, lack of better telescopic sights meant the ZF39 was used by snipers at the early stages of the war in the Eastern Front , but many snipers preferred captured Soviet rifles and custom-equipped German rifles with civilian scopes such ...
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.
A historic example of a long-eye relief (LER) telescopic sight is the German ZF41 which was used during World War II on Karabiner 98k rifles. An early example of a man-portable sight for low visibility/night use is the Zielgerät (aiming device) 1229 (ZG 1229), also known by its code name Vampir ("vampire").
Eye relief: 25 mm; Light permeability: >80%; Reticle illumination: Red tritium, glass ampoule; Illumination strength: Adjustable; Tritium ampoule lifetime: 8–12 years; Focus: −0.75 to −1.25 dioptres; Operational temperature: −46 to +71 °C; Range Settings: 100 to 600 meters (SUSAT L9A1) or 300 to 800 meters (SUSAT L12A1) in 100 m intervals
The eye relief was only 38 mm (1.5 in), so the sight was equipped with a rubber eyepiece shield to prevent the scope from hitting the face during recoil. The reticle was a thin crosshair, as was common for this time period. [4] These sights were fitted to the Hotchkiss M1909 Benét–Mercié machine gun. [5]
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 ...
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 ...