A catadioptric system combines lenses and mirrors to form an optical device, commonly used in telescopes and cameras. This design allows for compact construction while minimizing optical aberrations, resulting in clearer images. One popular example of a catadioptric telescope is the Schmidt-Cassegrain, which uses a spherical mirror and a corrector lens. This type of telescope is favored for its versatility and portability, making it suitable for both amateur and professional astronomers.