Monday, May 7, 2012
See What You’ve Been Missing with EyePal® Peep Sighting System by Charles L. Summers Let’s do a quick experiment. Roll up your index finger and make a hole, a small hole, and then hold your hand up to your eye. What you will see in that hole or aperture is that everything is in focus. Keeping that relationship, place your other hand with the thumb up at an arm’s length away from you. In this instance, there is a near object (your thumb) and the objects in the distance. Everything is in focus! The thumb mimics a pistol’s sights and the distant objects are in focus at any distance. Bringing the thumb closer to your rolled up hand aperture will show that it is still in focus even at the closer distance. The rolled-up index finger and hand eliminated most of the light except for the light from the small aperture. The occluder does this for the peep sight. The result of using a peep sight with an occluder is that everything is in focus, dependent only on the diameter of the aperture Now we’re onto something interesting. A simple aperture can produce Depth of Field (DoF). There remains another challenge: how is this optical science applied to iron-sight air guns? Many rear sights are comprised of a leaf sight or an aperture sight, some located just inches away from the eye. Let’s focus on the aperture sight. This “peep” sight is almost always out of focus and is commonly referred to as ghosted. The eye can deal with this situation effectively by placing the front sight in the center of this ghosted aperture. The front sight can be either in focus or out of focus, depending on your visual acuity. This applies to the target as well. We are taught to concentrate on the front sight centering on the target. The eye wants to gaze at the target and then back to the front sight and back to the target again. The eye can do this naturally or with the aid of prescription lenses. The natural, uncorrected eye will eventually get tired of doing this. The corrected eye will have to make use of the prescription to accomplish the task, slightly moving the head to get things “in focus”. In order for a peep sight to function properly, it needs what is called an occluder, the large opaque disk that surrounds the aperture. The eye sees the entire occluder and the peripheral field of view as well as the image of the aperture complete with Depth of Field. EyePal® uses the pinhole camera principle to create Depth of Field, allowing its user to see the front sight, back sight and target clearly at any distance while allowing peripheral vision. Clearly, EyePal will provide the Archer and Iron-sight shooter with any vision prescription, a sight picture with a limited field of view and depth of field at any distance. As a bonus, EyePal will not restrict peripheral vision in any way. Get your vision in top shape with EyePal® at www.EyePalUSA.com.