National Repository of Grey Literature 20 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
A Wide-Angle Photographic Camera of James G. Baker With the Paraboloidal Mirror
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Vápenka, David ; Tomka, David ; Thoř, Tomáš ; Pintr, Pavel ; Macner, David
A field of view of the paraboloidal mirror is small. Dominant aberration which limits its angular diameter is coma. Using correctors consisting lenses and aspherical plates star images of the mirror systems can be radically corrected. In this paper we present optical design of such photographic camera computed by James G. Baker. His device is composed of a paraboloidal mirror, a cemented dublet in front of focus and an aspherical plate placed in entrance parallel beam.
Residual Aberrations of the Gajdušek Objective Lens of Diameter 200 mm and Focal Length 3480 mm of the Observatory in Hradec Králové
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Vápenka, David ; Tomka, David ; Thoř, Tomáš ; Macner, David
The achromatic dublet of diameter 200 mm and focal length 3480 mm was manufactured by Professor ing. Vilém Gajdušek in Ostrava in 1954. The telescope with this objective is placed at the Observatory and planetarium in Hradec Králové. The objective was restored in the Institute of Plasma Physics, v.v.i.-Centrum Toptec in Turnov. During the process lens was measured and data were used for evaluation of its residual aberrations. We present the results of the measurement in this paper.
The Technology of Manufacture of a Positive Lens of Achromatic Dublet
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Šípová, Gabriela ; Ulrichová, Iva ; Franců, Helena ; Melich, Radek ; Vápenka, David ; Tomka, David ; Thoř, Tomáš
This paper deals with manufacturing of a positive lens of achromatic dublet. Diameter of the dublet is 158 mm and its focal length about 2500 mm. The glass material of the former lens was inhomogeneous and the dublet provided bad images. This is why we decided to manufacture new lens. The process was made by means of former machines of our workshop. The telescope with this dublet is placed at the Observatory of Turnov and serves for public astronomical observation.
The Digitalisation of the Maksutov Camera 350/840 of the Observatory in Úpice
Rail, Zdeněk ; Melich, Zbyněk
The Maksutov chamber with a diameter of 350 mm and a focal length of 840 mm was manufactured in Turnov in the early 1980s. At the Úpice Observatory it was used to photograph the sky for photographic film. Currently, we have been asked to convert it to a digital device. It was necessary to design and manufacture a correction element for the chamber to straighten its focal surface and to equip it with a suitable digital camera. In this work we present description of modification of this device.
The Residual Optical Aberrations of the Merz Objective Lens 108/1620 mm
Rail, Zdeněk ; Melich, Zbyněk ; Vápenka, David ; Šrajer, Bohdan
During the cleaning and adjustment of the Merz lens with a diameter of 108 mm and a focal length of 1620 mm, we had the opportunity to measure its optical parameters. From the measured values we made a calculation of residual optical defects of this achromatic lens. The results of these mathematical simulations are presented in this paper. The lens was made around 1923.
The Repair of an Objective Lens 160/2500 of the Observatory in Turnov
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Šípová, Gabriela ; Kaucká, Iva ; Franců, Helena ; Melich, Radek
This paper brings the information about repair of the achromatic objective lens of diameter 160mm and focal length 2500mm produced by the Development Optical Workshop of the ČSAV in Turnov. The refractor with this dublet has become the main telescope of a local astronomical observatory. The positive lens contained impurities – schlieren and it was necessary to produce a new lens and change it.
The Maksutov´s Systems from Turnov
Rail, Zdeněk ; Melich, Zbyněk ; Jareš, Daniel ; Pintr, Pavel ; Vápenka, David
This paper deals of a design and a manufacture of optical systems with the entrance meniscus corrector of Maksutov. Many of these high performance systems have been manufactured in several workshops in Turnov since Seventies. We present our experience with the optical design, manufacture and construction of the meniscus telescopes and cameras in this article.
The Simulation of Residual Optical Aberrations of the Objective Lens of Merz 124/1477
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan
This objective lens was renoved in the Institute of Plasma Physics, v.v.i. Center Toptec in Turnov. During the process we got a possibility to measure the objective lens on the optical bench and to evaluate its residual optical aberrations. The objective lens was manufactured in 1860-1870 years
The Optical Parameters of Objective Lens Secrétan Paris 130/1930 of Observatory of Úpice
Rail, Zdeněk ; Melich, Zbyněk
The Optical Parameters of Objective Lens Secrétan Paris 130/1930 of Observatory of Úpice Objective lens of Secrétan Paris 130/1930 of Úpice observatory was cleaned a measured its optical parameters in IPP AS CR, v.v.i. - TOPTEC. In this paper we present results of mathematical simulation of residual aberrations of this lens.
The Catadioptric System of G.M. Popov of the Observatory of Úpice
Rail, Zdeněk ; Melich, Zbyněk
During the Sixties of the Twentieth Century series of two-mirror catadioptric telescopes were designed with a correcting lens in front of their secondary mirror. One of the first designers of these devices was P.P. Argunov. His optical designs were further developed by G.M. Popov, J. Klevcov and other opticians. In 2005 one telescope of a Popov system of diameter 305 mm was manufactured in the Development Optical Workshop of Academy of Sciences of Czech Republic /now Institute of Plasma Physics of AS CR,v.v.i.-Toptec/ in Turnov. The telescope was intended to substitute an older Maksutov-Cassegrain telescope of diameter of 260 mm of the Observatory in Úpice which required the reconstruction. In this paper we present an optical design of the Popov´s system of the Observatory in Úpice and compare it with an equal commercial Schmidt-Cassegrain telescope and further devices.\n

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