This paper discusses four types of four-mirror telescope systems based on an afocal two-mirror system with a spherical primary mirror. The possibilities of correcting astigmatism and curvature of field are analyzed. © 2005 Optical Society of America
A. V. Bakholdin, V. A. Zverev, and G. É. Romanova, "The optical system of a very large telescope," J. Opt. Technol. 72, 182-185 (2005)
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