u003cbr/u003eWhen using, adjust the eyecup position. Make sure you look through the binoculars, and you can see the entire view without vignetting.u003cbr/u003eu003cbr/u003eThen, adjust the interpupillary distance according to your eyes. You will know if it is correctly aligned when it forms a perfect circle.u003cbr/u003eu003cbr/u003eLastly, adjust the diopter for both eyes to ensure better focusing. When viewing a different object, adjust the focus on the eyes separately.