Exit Pupil

Exit pupil of an 8x42 model: 42 ÷ 8 = 5.25mm

The exit pupil is the beam of light that exits each eyepiece and enters the user's eyes. The larger the exit pupil, the brighter the image will appear in low light conditions.

The exit pupil is measured in millimeters. To calculate the exit pupil, divide the size of the objective lens in millimeters by the magnification.

Exit Pupil = Objective Lens ÷ Magnfication

Our Eagle Optics professionals are available to answer your questions at 1-800-289-1132 or info@eagleoptics.com.