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Set the interpupillary distance by grasping the barrel and strapping the body of the binoculars until you can see a circle of vision. Turn the center focus wheel, close the right eye and focus on the left until the object looks sharp and clear.Then open the right eye, close the left eye, and turn the right eyepiece until the object is clear.Now that both sides are in focus, objects at different distances can be focused by rotating the center wheel.Note the setting on the night eyepiece scale. Just go back to the same settings for later use.The convenient eye mask folds up for use with glasses, and folds up for use without glasses. They provide comfort and facilitate viewing convenience. parameter: Model: 30 x 60, Structure: Binoculars, Feature Type: Telescope, Instrument magnification: 8 times, Objective lens diameter: 60mm, Exit pupil distance: 90mm, Exit pupil diameter: 24mm, Field of view: 126m / 1000m, Resolution: 7.2 degrees, Minimum focus distance: 8m.