Kassegrena, fokus
Tochka na opticheskoi osi, v kotoroi formiruetsya izobrazhenie zvezdy v teleskope-reflektore sistemy Kassegrena. Raspolozhena vblizi central'nogo otverstiya v glavnom zerkale, skvoz' kotoroe prohodyat luchi, otrazhennye vtorichnym giperbolicheskim zerkalom. Obychno v fokuse Kassegrena razmeshayut fotometry ili spektrografy.Surdin V.G., GAISh, Moskva
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Kassegrena, fokus
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