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Encyclopedia > Eye relief

The eye relief of a telescope 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 badly designed optical system may force the observer to press their eye close to the eyepiece 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.


  Results from FactBites:
 
Eye relief - Wikipedia, the free encyclopedia (208 words)
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.
The eye of an eyeglass wearer is typically further from the eye piece which necessitates a longer eye relief in order to still see the entire field of view.
Birding Binoculars 5 - Eye Relief (505 words)
Eye relief is how far back from the eyepiece your eye can be and still see the whole field of view.
To measure eye relief yourself, point the binoculars' objectives at a bright light source and move a paper back and forth near the eyepieces.
The eye relief is the distance from the eyepiece at which the circle of light comes into sharpest focus.
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