Diopter adjustment
Friday, June 27th, 2008Roughly all binoculars have a “diopter adjustment” which allows you to set the two sides of your binoculars to match the differences between your eyes. You can find it on the right side, you can see zero marked between a plus and a minus sign. Make sure its at zero before you start this adjustment.
• Place the lens cap or the palm of your right hand over the right objective lens (or the left hand over the left lens if that’s the side with the diopter adjustment) and focus on the object using the central focus. Make the focus as crisp as you can. Try to do this without closing your other eye.
• Switch your hand or lens cap to cover the other objective lens, and now make the same object as crisp as you can using the diopter adjustment.
• Switch your hand or lens cap again to double check how good the focus is-if adjustments are necessary, use the central focus.
• Then switch your hand or lens cap one last time, and fine tune the diopter adjustment.
• Now look through both lenses, and make sure the object is well-focused. Focus on something closer, and something farther away, using the central focus, to make sure the binoculars are set right. Then notice exactly where the diopter adjustment is set. This is where it should stay whenever you use your binoculars. (If you sometimes wear different glasses or contact lenses, your diopter adjustment setting may be different in those situations.) You should always use the center focus now.
Once in a while you should retest the diopter setting in case your vision has changed.


















