Celestron TrailSeeker 8x42 Binoculars User Guide - Page 6

Setting the Diopter / Focusing To ensure a crisp, sharp image the focusing system of the binocular must be set to compensate for any differences in your eyesight. This is achieved by setting the diopter (located on the right eyepiece) before use. To set the binocular to your eyesight follow the instructions below. 1. View an object in the distance through the binocular. 2. Cover the right objective lens with your hand or the objective lens cap. 3. Rotate the focus wheel until the image viewed with your left eye is clear and sharp. 4. Cover the left objective lens with your hand or objective lens cap. 5. Viewing the same object, adjust the diopter ring until the image viewed with your right eye is clear and sharp. 6. Your binocular is now adjusted to your eyes and focusing on any object can now be achieved by simply turning the focus wheel. Tip: Eyeglasses worn for nearsightedness should be worn when using binoculars as you may not be able to obtain focus at infinity without them. Diopter Adjustment Ring Focus Wheel Fig 3 4 I ENGLISH