Key FeaturesCompatibility: It clamps onto the eyepieces of telescopes, binoculars, spotting scopes, and microscopes.

3-Axis Adjustment: The orange/bronze and black tension dials let you precisely adjust the position of your phone's camera along the X, Y, and Z axes to perfectly align it with the lens

Used for digiscoping, which allows you to mount a mobile phone to optical equipment to take photos and videos through the eyepiece

All three adjustment knobs and the phone clamp are working properly. The smaller eyepiece adapter rings not included. Unboxed.