What are the characteristics of folding reflecting telescope?

There is a kind of Maksutov telescope, in which a meniscus lens is added in front of the spherical reflector. By choosing appropriate parameters and positions of the meniscus lens, spherical aberration and coma aberration can be corrected at the same time. And the derivatives of these two kinds of telescopes, such as super Schmidt telescope, Baker-Noon camera and so on. Reflective telescope is characterized by large aperture, even greater than 1, strong light, large field of view and excellent imaging quality. Suitable for sky survey photography and observation of nebulae, comets, meteors and other celestial bodies. The mirror of the reflective telescope is protected by the secondary mirror, which is not easy to be attacked by pollutants such as dust.