The present invention provides an optical
sight with rangefinder and
assembly method thereof. The optical
sight comprises an erector lens unit, a photoelectric rangefinding unit, a
barrel, an objective lens unit, a plurality of adjusting elements, a
power supply unit and an
eyepiece lens unit disposed on the
barrel. The photoelectric rangefinding unit includes a
laser emitter, a
laser receiver and a range indicator. A plurality of openings are formed on sidewall of the
barrel corresponding to the positions of the
laser emitter, laser
receiver and range indicator for conducting the cavity to outside the barrel. The
assembly method comprises the steps of: assembling the erector lens unit, the photoelectric rangefinding unit and the barrel together, then connecting an objective lens unit and mounting a plurality of adjusting elements, adjusting the objective lens unit and mounting the adjusting elements and the
power supply unit, adjusting the focus of the laser emitter and the laser
receiver and adjusting the position of the range indicator through the openings formed on the barrel for complying with the requirement of photoelectric rangefinding performance. The
assembly method of the optical
sight according to the present invention can be adjusted after all elements are assembled. The assembly method of the optical sight according to the present invention can be used to reduce the adjusting times and prevent unnecessary disassemblies and re-assemblies for simplifying the assembly process and improving the
yield rate and the productibility of the optical sight.