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Catadioptric systems of Argunov, Popov and Klevcov
Rail, Zdeněk ; Jareš, Daniel ; Lédl, Vít
This paper deals with two-mirror systems of Argunov, Popov and Klevcov which use meniscus correctors in convergent beam of light placed near their secondaries. These systems make possible to construct of highly aberration corrected devices. Several telescopes of this type are producted commercialy and belong to the best corrected catadioptric systems.
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The Corrector of Volosov
Rail, Zdeněk ; Jareš, Daniel ; Lédl, Vít
Soon after discovery of meniscus telescope of Maksutov optical properties of doublet corrector was researched. Doublet was placed into parallel light beam in front of common optical system. Afocal corrector composed of two thin lenses of the same glass enables to correct optical aberrations of many systems and to reach radical improvement of their imaging properties. Compared to Schmidt plate doublet corrector possesses only spherical surfaces and its manufacturing tolerances are much freer than meniscus of Maksutov. Derivation of main equations was performed by Volosov, Galpern and Grebenshchikova in 1943. Our paper deals with optical aberrations of the system consisting of common aspherical mirror and corrector of Volosov. These systems are less known among opticians and astronomers but enable construction of fast cameras and telescopes.
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Schmidt-Cassegrain Telescopes
Jareš, Daniel ; Lédl, Vít ; Rail, Zdeněk
This paper describes analysis of residual aberrations of Schmidt-Cassegrain telescopes (SCT). Though SCTs have been produced for 30 years, problem of imaging properties is only rarely discussed. At first we have performed measurement of optical parameters of several commercially produced SCT telescopes of Meade, Celestron and Carl Zeiss Jena, then we have used measured data to construct the models of these system with the help of Zemax program and evaluate residual aberrations. We have found that it is possible to radically improve these systems by changing entry data.
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Imaging system for spectrograph with multichanell Šolc filter
Rail, Zdeněk ; Lédl, Vít ; Jareš, Daniel
Solving the problem of solar spectrograph telescope,we have made research of possible imaging systems for spectrograph with multichanell Šolc filter.We have decided to use off-axis unobstructed Maksutov telescope,which is able to meet our demands for constant solar image scale in wavelenght within 380 to 760 nm.This telescope provides good image contrast similar to apochromatic objective lens uses only classical materials. Diameter of the telescope is 140 mm,focal length is 2000 mm.
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