Reflecting telescopes can be divided into main focus system, Newton system, Cassegrain system, Gregorian system, folding axis system, etc. due to the different working focus. Through the transformation of the mirror surface, the main focus system (or Newton system), Cassegrain system and folding axis system. The focal points of these systems are called main focal points, Newtonian focal points, Cassegrain focal points, Gregorian focal points, and folding axis focal points. When the above-mentioned systems are used as telescopes, they are called Newton telescopes, Cassegrain telescopes, Gregorian telescopes, and folding axis telescopes. Large-scale optical reflecting telescopes are mainly used for astrophysics research, especially for the light splitting, photometry and photographing of faint celestial bodies.
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