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Telescopes Optics Type of build Maksutov

Maksutov-Cassegrain telescopes have a compact design, but a very long focal length. At the front there is a Maksutov lens. These telescopes are very well suited for planetary observing.
Maksutov Grafik Teleskop

Lens instead of plate

The difference to the Schmidt-Cassegrain: the Maksutov has a meniscus-shaped lens on the lens aperture and no Schmidt plate. This lens design was created by the Russian optician Maksutov.

A telescope for planetary observing

But what are the benefits? With a uniform thickness of the lens, the system displays only slight chromatic aberration. In addition, it corrects the spherical aberration created by the primary mirror.

The system’s secondary mirror is vapour-deposited on the rear side of the meniscus lens. Therefore there is no secondary mirror spider vanes which would bend the light. Since the secondary mirror is small there is only a small amount of shadow. This means: very good contrast, comparable to that of a refractor.

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