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RE: Off Axis Optics

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Posted by Jarvis Krumbein, jkrumbein@juno.com on May 4, 2000 03:49:47 UTC

The simplest off axis optical system, and the easiest to make, is the Schiefspiegler. In its simplist form it consists of two equal radius spherical mirrors. The concave is done in the usual way to completion as a sphere and then the tool is polished and used as the convex secondary. These are usually made with f-ratios of 25 or more and are perfect for high power planetary observing. Before embarking on any construction project, I would strongly recommend getting a copy of "Telescope Optics, Evaluation and Design" by Harrie Rutten and Martin van Venrooij. This is available from Willmann-Bell. This book will give you a much greater understanding of the various optical designs and there advantages and disadvantages.

Good luck,

JK

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