17 September 2012 Fast and compact wide-field Gregorian telescope
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A traditional Gregorian telescope features an intermediate focus, which makes the system longer than an equivalent fnumber Cassegrain design. One could shorten the Gregorian system by inserting a flat mirror before the secondary mirror. We explore the potential of this compact configuration for sky survey imaging with relaxed requirements for angular resolution. A 0.5 m f/1.4 telescope with 4 deg full field is presented. The modified design consists of two elliptical mirrors and a folding flat in between. A plano-convex field flattener is used near the focal plane. The telescope optical performance is analyzed and possible improvements are discussed based on aberration balancing. A special emphasis is given to stay light analysis and baffle designs are considered.
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Mehdi Bahrami, Mehdi Bahrami, Alexander V. Goncharov, Alexander V. Goncharov, } "Fast and compact wide-field Gregorian telescope", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84446H (17 September 2012); doi: 10.1117/12.925437; https://doi.org/10.1117/12.925437


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