When you look through your rangefinder, if you find that the view is blurry, you may need to make a slight adjustment by using the white-colored eyepiece. Rotate the eyepiece and adjust it like how you would adjust the lens of binoculars or a camera. To adjust, turn the eyepiece to the middle. The view through the scope and the distances should become very clear. You can adjust the eyepiece further as required.