Everything about Argunov-cassegrain Telescope totally explained
The
Argunov Cassegrain telescope is a
telescope design first introduced in 1972 by P.P. Argunov. All optics are
spherical, and the classical
Cassegrain secondary mirror is replaced by three air-spaced
lens elements. The element farthest from the primary mirror is a
Mangin mirror, which acts as a second surface mirror, having a reflective coating applied to the surface facing the sky. Argunov systems only employ spherical surfaces and avoid the practical difficulties of making and testing
aspheres. However, this seeming benefit is marginal, as it's almost as difficult to make a true, zone-free sphere of precise
radius of curvature as it's to make an asphere of equivalent precision.
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