Installation guidance:
1, Stretch out the clamp, place your phone in it and then loosen the screw on the clamp.
2, Align the center hole perfectly with your phone main camera, tighten the screw on the phone clamp.
3, Attach the adapter to the eyepiece and fasten the screw sitting under the eyepiece cup.
4, Double check to make sure your phone is tightly held by the clamp and adapter is stably attached to the eyepiece of your optical instrument.