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Bushnell Corporation is an American firm that specializes in sporting optics and outdoor products. It is based in Overland Park, Kansas and is a wholly-owned subsidiary of Vista Outdoor . Bushnell makes binoculars , telescopes , spotting scopes , riflescopes , red dot sights , GPS devices , laser rangefinders , game cameras , night-vision ...
A United States Marine firing an M4 carbine, using an EOTech holographic sight to aim.. The first-generation holographic sight was introduced by EOTech—then an ERIM subsidiary—at the 1996 SHOT Show, [2] under the trade name HoloSight by Bushnell, with whom the company was partnered at the time, initially aiming for the civilian sport shooting and hunting market.
Eye relief – Eye relief is the distance from the rear eyepiece lens to the exit pupil or eye point. [15] It is the optimal distance the observer must position their eye behind the eyepiece to see a non-vignetted image. The longer the focal length of the eyepiece, the greater the eye relief.
Because the focal change effected by the adjustable eyepiece can be measured in the customary unit of refractive power, the dioptre, the adjustable eyepiece itself is often called a dioptre. Once this adjustment has been made for a given viewer, the binoculars can be refocused on an object at a different distance by using the focusing wheel to ...
For a shooter, eye relief is also a safety consideration. If the eye relief of a telescopic sight is too short, leaving the eye close to the sight, the firearm's recoil can force the optic's eyepiece to hit and cut into the skin around the shooter's eye, leaving a curved scarring laceration on the medial end of the supraorbital ridge and the ...
(The eyepiece and the eye together make an image of the image created by the objective, on the retina of the eye.) The amount of magnification depends on the focal length of the eyepiece. An eyepiece consists of several "lens elements" in a housing, with a "barrel" on one end. The barrel is shaped to fit in a special opening of the instrument ...