Exit Pupil

Binocular Terminology

 
The exit pupil is the magnified image in the eyepiece and it is extremely important how its diameter relates to the pupil size of your eye. It determines the quantity of light reaching the eye. The formula to get the diameter is: objective diameter divided by magnification, e.g. 7 x 50 binocular = 50 : 7 = 7.14mm. The larger the exit pupil's diameter the brighter the observed image in situations of low available light, since the eye pupil size rises (approx. 7mm at young age; approx. 5mm at age 50). On a bright day an exit pupil of approx. 2.5mm to 4mm is the optimum. The exit pupil does not relate to other factors of a binocular.
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