The invention discloses a catadioptric astronomical
telescope and a telescoping device. The catadioptric astronomical
telescope comprises a lens cone and lens assemblies, wherein the lens assemblies are arranged in an inner cavity of the lens cone, the lens assemblies include a first front correcting lens
assembly, a second front correcting lens
assembly, a catadioptric lens
assembly, a rear correcting lens assembly and a main reflecting lens assembly which are arranged in the inner cavity of the lens cone sequentially, and a central axis of the lens cone is concentric with optical axes of thefirst front correcting lens assembly, the second front correcting lens assembly, the catadioptric lens assembly, the rear correcting lens assembly and the main correcting lens assembly. The catadioptric astronomical
telescope and the telescoping device have the advantages that by adding appropriate number of catadioptric lenses,
chromatic aberration of the telescoping device is reduced maximally,and a telescope body of the telescope can be shortened effectively; by adopting two groups correcting lens assemblies in the front and back, paraxial aberrations including
coma aberration, position chromatism and the like are eliminated effectively, and good qualities of focused images in broad-spectrum bands are guaranteed.