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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
A Glued Objective Lens of the Steinheil Type
 Rail, Zdeněk ; Franců, Helena ; Ulrichová, Iva ; Šípová, Gabriela ; Jareš, Daniel ; Kuryshev, V. ; Vápenka, David
This paper analyses the achromatic dublets with an entrance lens of the flint glass. The objective lens of this construction were devised by German physician Carl August Steinheil in the half of the 19 th century. Several pieces of these dublets were manufactured for astronomical purposes in our workshop in the past. We discuse the mathematical evaluation and the method of manufacture of the glued Steinheil objective with plane exit surface.
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The Spherochromatic Aberration of the Clark‘s Objective Lens of the Ondřejov Observatory
 Rail, Zdeněk ; Šrajer, Bohdan ; Jareš, Daniel ; Vápenka, David ; Pintr, Pavel
In our paper the results of mathematical simulations of the residual aberrations of Clark‘s 8 inch (diameter 203.2 mm) objective lens are presented. This achromatic dublet has been used at the Ondřejov Observatory for more than 100 years mostly for solar observation.
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