A Schmidt-Cassegrain telescope is a type of compound telescope that combines features of both the Schmidt and Cassegrain designs. It uses a spherical primary mirror and a corrector plate to reduce optical aberrations, allowing for clearer images. This design makes it compact and portable, making it popular among amateur astronomers. The telescope's light-gathering ability is enhanced by its large aperture, which allows for detailed observations of celestial objects. It typically features a focal ratio that makes it versatile for both planetary and deep-sky viewing. Overall, the Schmidt-Cassegrain is known for its ease of use and adaptability.