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21 February 1986 New Telescope Design Using Refraction Of Prism Rows
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In existing types of telescope lenses or mirrors elements with spherical and aspherical surfaces, which are expensive in design and manufacturing, are used. Manufacturing of telescopes with significant or adjustable magnification increases its complexity and cost. The usage of the prismatic telescope, allows to develop cheaper optical telescopes manufacturing, due to use of simple and similar elements in its design. Prismatic's telescope magnification may be easily controlled by deviating the prismatic elements. In existing telescope designs, magnification is proportional to objective focal length and in inverse ratio to eyepiece focal length. Owing to the fact that the eyepiece focal length cannot be changed significantly, magnification is considered proportional to objective focal length. For significant magnifications, it is necessary to use objectives featuring big focal length. This makes the telescope heavier and more complicated, because the weight of a telescope with invariable F-number, is approximately proportional to the objective's focal length cubic value. A prismatic telescope consisting of consecutively arranged prism rows, changes the relative angle between parallel ray bundles, entering the telescope, into two orthogonal directions. Light dispersion in it can mutually be compensated by locating prism wedges in opposite directions.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark Shechterman "New Telescope Design Using Refraction Of Prism Rows", Proc. SPIE 0571, Large Optics Technology, (21 February 1986);


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