Catadioptric Telescopes

these are reflectors with a thin lens, known as a corrector plate, across the front of the tube to increase the field of view. Light passes through the corrector plate and onto the main mirror, from where it is reflected to a convex secondary, which is usually attached to the rear of the corrector plate. the secondary reflects the light back down the tube into the eyepiece, which is positioned in the center of the main mirror. Catadioptrics are popular because they are compact and portable, although they are more expensive than reflectors.

corrector, plate light enters corrector, plate light enters

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