Abstract: One preferred embodiment of the invention comprises a catadioptric telescope comprising a primary mirror, a secondary mirror, and a corrector. The primary mirror, secondary mirror, and corrector are disposed along an optical path. A tube assembly preferably houses the primary mirror and corrector. The secondary mirror is preferably centrally located within and connected to the corrector. One or more actuators are mechanically connected to the corrector (and the secondary mirror affixed to the corrector). The actuators are movable such that the corrector and secondary mirror may be moved with respect to the primary mirror. By manipulating the position and/or orientation of the secondary mirror, the telescope may be focused and/or collimated.