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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.
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 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.
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
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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 ...
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