If your naked eyes are about the same size as the exit pupil, you’d be able to see clear images. Meanwhile, a SMALL pupil diameter helps produce a good image in bright conditions. When you’re in the center of the woods looking for your next target, you need to have the BEST resources at hand to shoot well.Īn important consideration is the objective lens diameter of the exit pupil.Īs seen in the formula for the pupil’s diameter, the magnification power of the lens is connected to its size.Ī LARGE pupil diameter helps produce a good image in low light conditions. In the same sense, the exit pupil on rifle scopes serves the same function. When you find yourself in low light conditions, your pupil expands. When you find yourself in bright light, your eye’s pupil SHRINKS so that you can see a clearer image. This is because the human eye isn’t accustomed to so much light or so many light rays. You’d automatically raise your hand to protect your eyes, right? Imagine walking out of a dark area into a bright area. Can make a difference in bright and dark areas.Lessens eye strain/protects our naked eyes.There are various reasons why the exit pupil is one of the most important parts of a rifle scope. Why Is Exit Pupil Important in Rifle Scopes? I use this formula anytime you want to calculate the size of the exit pupil. This means that the size of the exit pupil calculated would be 8 mm. To calculate the scope’s exit pupil, we’d use the previous formula to get The objective lens is 32 mm, and the magnification is 4x. Let’s say that we’re looking at a 4 x 32 mm rifle scope, and you want to measure the exit pupil’s diameter. This will get you the estimated size of the scope’s exit pupil. (Objective lens diameter in millimeters) / (magnification) If I told you that the exit pupil should be calculated on your own, you’d probably be quite hesitant.īut the good news is that you only need to know the magnification and diameter of your lens!Īfter identifying these, use this simple formula: How Is Exit Pupil Measured and Calculated? This is seen through the back of the lens system. The exit pupil (also referred to as a virtual aperture) is the optical image of the virtual aperture. This is seen through the front of the lens system. To solve this, I identify the entrance pupil as the optical image of the aperture. The system is focused on an object plane, and rays start from the center of the object plane. Imagine an imaging system with various apertures positioned differently in the beam path. How do you take all of these aspects into consideration? Here’s where the ENTRANCE pupil and EXIT pupil come in. The position of an optical aperture can affect the opening angle.The effect of an optical aperture can be changed because of other optical elements.Try imagining an optical system that contains various optical apertures that limit the light rays that can pass through. The size of the exit pupil is ALWAYS smaller than the eyepiece and is measured in millimeters (mm). When you look through the ocular lens, the exit pupil shows the diameter of light that leaves the eyepiece. You’ll see a bright disc or a bright circle of light in the center - that’s when I learned that that disc is the exit pupil. Position your eye around 10 inches from the eyepiece and along the optical axis. Try adjusting the scope’s magnification to full, then direct it towards the sky. To help explain it a little better, here’s a little exercise I learned. Are Exit Pupil Scopes Only for Hunting and Shooting Sports?.How to Choose an Exit Pupil for Your Scope.What Is the Function of a Small Exit Pupil?.What Is the Function of a Large Exit Pupil?.What Is a Good Exit Pupil for a Rifle Scope?.How Does the Exit Pupil Impact Shooting?.Why Is Exit Pupil Important in Rifle Scopes?.How Is Exit Pupil Measured and Calculated?.
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