Hold the lens cones and spin first, adjust it until you can see a clear image. The right eyepiece has three marks: +?o?and -, make the o aim at the dot. Close your right eye and use the left one, spin the middle revolving wheel continually until you can see the clearest image. Close your left eye and use the right one, if the image is not clear enough, you can spin and adjust the right eyepiece. Once two eyepiece have adjusted. Then you can see different distance objective and adjust the middle revolving wheel to the best position.