How to collimate the Newtonian reflector by Vincent S. FosterBefore you can observe with a Newtonian reflector telescope, it is necessary to align or collimate its optical parts. The goal of collimation is to ensure that both the primary and secondary mirrors, as well as the eyepiece, are properly aligned to provide clear, sharp views. You might think that collimation begins with the primary mirror because it is the most important part of the optical system. system. Curiously, this is not the case. Collimation is performed backwards, starting from the focuser and moving up to the primary. The reason is simple. Before you can adjust the most important optics, all the less important optical parts must do their job properly. Think of it this way and it makes perfect sense. For fast and efficient collimation, a laser collimator is required. Laser collimators are very precise and easy to use. In general you adjust the mirrors until the beam hits the center points on both mirrors and returns directly to the laser exit hole. To obtain the best collimation it is essential to "center"...