A multi-magnification reflective telescope of an optical system includes a case, a shared primary mirror coupled to the case, and a secondary mirror coupled to the case. The shared primary mirror is configured to expand a beam of electromagnetic radiation and the secondary mirror is configured to direct the beam of electromagnetic radiation to and to receive the target image from the shared primary mirror. The multi-magnification reflective telescope is configured to simultaneously direct the beam of electromagnetic radiation along a laser output path toward a target and to receive a target image along an imaging optical path and to direct the target image to one or more detectors simultaneously.