A function for eyeglass wearers that allows your eyes to be at a greater distance from the eyepiece.
As the name implies, eye relief refers to the distance, in millimeters, that an optical device can be held from the eye and the full field of view can still be comfortably observed. Individuals with glasses benefit in particular from longer eye relief with all optical devices. Considerable eye relief is also imperative when using riflescopes due to recoil. Without it, a sportsman risks serious eye trauma.
(mm) A binocular's eye relief is the distance it can be held away from the eye that still allows the user to see the entire full, field-of-view. A longer eye relief is advantageous for glasses wearers, who cannot get as close to the eyepiece.
Measured in mm, it is the actual distance, your eyes could be from the surface, of the eyepiece and still see the full image.
The distance a scope can be held away from the eye and still present the full field of view. Tasco riflescopes provide an extra margin of comfort and recoil safety with extended eye relief and soft neoprene eyepiece guards.
The distance between the lens of an eyepiece and the point behind the eyepiece where all the light rays of the exit pupil come to a focus and the image is formed. It is the distance from the eyepiece at which the eye can be held and correctly see the image produced by the eyepiece.
The distance from the scope to the human eye that the scope must be held in order to get a full, clear view. Eye Relief is determined by power of magnification and quality of design and construction. The higher the power, and the shorter the scope, typically, the shorter the eye relief. Eye relief is both a safety and usability consideration. A high-power rifle can cut the user's face with the scope under recoil. (I heard this called "The Mark of the Magnum" on Field of View n. The width (usually in feet) of viewed area at a given distance, usually 100 yards. Field of view decreases with magnification, and increases with viewing distance and lens size. This is why astronomical telescopes have small "spotting scopes" attached. The small, low-power scope has a wide-angle view used to find the star, and then it can be found with the large, narrow-angle hi-power telescope. Big-game hunters typically need a large field of view, as they view game that is moving, and they are not steadied by any bench, bipod or rest. The closer the game, the larger the field of view should be.
The distance from the eye lens of the eyepiece to the exit pupil. Spectacle wearers require sufficient eye relief to enable them to place the eye at the exit pupil.
This is the distance that the binocular can be held from your eyes and still provide a good image. Eyeglass wearers will need a longer eye relief because the binoculars will be held against their glasses- further from their eyes. Tips: A longer eye relief is generally preferable but a simple, effective solution, though not always used, is having adjustable eye cups. These can usually make up for shorter eye relief, which is common in lower end binoculars.
The eye relief of an eyepiece is the distance your eye can be from the eyepiece and still see the entire field of view. back to the top
The distance a spotting scope can be held away from the eye and still present the full field-of-view. Extended or long eye relief reduces eyestrain and is ideal for eyeglass wearers.
Distance from eyelens outside surface to the top of the eyecup of an instrument, e.g: binocular. Most comfortable when this distance is between 10 and 20 mm.
Shown in parentheses in the test tables, eye relief is the distance in millimeters between the eyepiece lens and the exit pupil, where the eye must be placed to see the full FOV. An eye relief of about 20mm is needed to enable eyeglass wearers to see a full FOV. Eye relief for telescopic sights is measured in inches, with 3 inches the minimum for hard-kicking firearms.
The distance the eye must be placed from the eyepiece to obtain sharpest vision.
The focus-range distance between the userâ€(tm)s eye and the eyepiece lens of an optical device at which the viewed scene can clearly be seen.
The distance between the eyepiece and the eye where you can see the entire image through a telescope or binoculars. Eyeglass wearers need longer eye relief.
The distance, usually about 4 inches, between the shooter's eye and the rearmost part of the sights. This distance is important both for good vision of the target and to prevent injury when shooting a gun with significant recoil. In the case of Telescopic Sights there are special models available for use with hand guns which have extended eye relief, so as to allow their use at about 18 inches from the eye.
The maximum distance your eye can be moved away from the eyepiece and still see the whole image.
The distance the eye must be positioned behind the eyepiece to provide a full viewing field.
The eye relief of a telescope, a microscope, or binoculars is the distance from the eyepiece the eye can be placed at which the exit pupil is approximately the same size as the eye's pupil. A poorly designed optical system may force the observer to press his or her eye close to the eyepiece in order to see an unvignetted image, or alternatively may have an exit pupil larger than the observer's pupil at a comfortable viewing position, resulting in wastage of light and a dimmer than optimum image.