However, because of the complexity of fabricating and testing a large aperture hyperbolic mirror (just ask the people who built the Hubble Space Telescope), traditional two-mirror Ritchey-Chrétiens are very expensive to manufacture and purchase. For example, the Hubble Space Telescope and the twin 10-meter Keck telescopes in Hawaii are Ritchey-Chrétiens. The RC is the design of choice for most of the major professional observatory telescopes built in the last half-century. Because of this wide field and a relatively fast focal ratio, the Ritchey-Chrétien design is particularly well suited to astrophotography.
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