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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.
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 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.
Telescopic sights with relatively long eye relief are favorable to avoid periorbital lacerations and eye injuries caused by recoil-induced collision with the metal eyepiece (colloquially known as a "scope bite"), especially in instances where it is difficult to keep the stock steady.
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 ...
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