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Additional resources for Amateur telescope making
A ﬂat-black screen made of poster board or other material placed around the focuser/eyepiece area is one solution. Another is to use a photographer’s cloth to cover the head and the viewing end of the telescope. e. black), which preserves the eye’s dark adaptation just as reading star charts with a red light does. ) Ritchey–Chrétien In an effort to improve the imaging quality of the classical Cassegrain reﬂector for photographic work, George Ritchey and Henri Chrétien jointly developed a marvelous new system in the early 1900s known as the Ritchey–Chrétien.
5-inch f/14 Maksutov–Cassegrain became the world’s ﬁrst commercially available catadioptric telescope. 1. The optical conﬁguration and light-path of a catadioptric telescope. The form seen here is the Maksutov–Cassegrain, which uses a thick, steeply-curved meniscus lens to eliminate the aberrations of the steep spherical primary mirror. 2. 5-inch Maksutov–Cassegrain catadioptric, long considered the ﬁnest small telescope ever made. This beautiful instrument is truly a work of art, both optically and mechanically.
One is the coudé system, widely used by professional observatories in conjunction with both Cassegrain and Ritchey–Chrétien reﬂectors. Here, a small ﬂat tertiary (third) mirror located above the primary intercepts the converging light-cone from the convex secondary and directs it down the telescope’s polar axis. This makes it possible to keep the focal position ﬁ xed no matter where the scope is pointed in the sky, and to feed the light into spectrographs and other instrumentation too large and heavy to be supported by the telescope itself.