Description: 【Calibration Steps】Aim at a daytime object using the low power eyepiece (20mm). Observe the same object through the starfinder’s eyepiece. Without moving the main telescope, adjust the starfinder’s alignment screws on the bracket until the object is centered in the starfinder’s crosshair 【Usage】The finder scope is a secondary scope that's used to help you locate objects in the main telescope; 3 thumb screws allow positioning XY adjustment for accurate telescope alignment 【5x24 Finder Scope for Astronomical Telescopes】5x24 low power magnification; the telescope fixed to the body of a more powerful telescope and pointed in the same direction for initially locating an object to be observed 【Easy to Install】Finder Scope with Mounting Bracket, the bracket fits any telescope optical tubes. Mounting bracket has curved base with two holes and attaches to telescope tube with bolts or screws; bracket will not slide into a dovetail base 【Professional Accessories】Universal 5x24 Finder Scope with Mounting Bracket, Optical Finder for Telescope Initial Positioning Package Includes: 1 Finder Scope Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.