The optical design precludes fitting a diaphragm and the aperture of these lenses is always fixed. Light adjustment can only be by use of neutral density filters giving no control over depth-of-field, which is always minimal.

Chromatic aberration

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Catadioptric lenses have relatively low contrast, quite acceptable for astronomy but a severe drawback for general photography. In addition, out-of-focus highlights will appear as doughnut shapes, distinctive and not always pleasing.

Concavemirror

The short broad shape of a catadioptric lens is very distinctive, as is the back of the secondary mirror visible at the front of the lens. Light is reflected by the primary mirror at the rear of the lens onto the much smaller secondary mirror and from it through conventional optics onto the film or sensor. This double folding of the light path makes the lens very short for its focal length. The large primary mirror provides most of the magnification.

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Dobsonian telescope

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Mirror lenses, or catadioptric lenses, combine curved mirrors (catoptrics) with glass lens elements (dioptrics). Used only for telephoto lenses, the design provides a much shorter, lighter, and less expensive lens than a comparable conventional telephoto lens.

Catadioptric

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Fresnellens

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Cassegrain telescope

Relatively small size and light weight are the main advantages for a photographer. The catadioptric design provides a very high degree of optical correction, making such lenses popular for astronomy.

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