The wide-angle optical system TELESCOPE VT-78D

摘要

(57) The optical system of the telescope contains mounted along the beam three-lens corrector consisting of a biconvex positive biconcave negative and the concavo-convex negative spherical lens at a distance from each other, the main concave spherical mirror and a secondary spherical mirror, disposed on the rear surface is concave -convex negative lens corrector input and two off-axis aberration compensating spherical lenses spaced apart, optically e corrector elements and the first three-lens along the beam path compensating lens is made of uniform optical material such as "crown" and the second compensating lens - "flint" type of optical material. Further along the beam positioned detector window of fused quartz, and is in the focus of the flat detector. The optical system provides a rms diameter of images of stars across the field of view of 5-6 microns (2.4 - 3.1 arcseconds) at a diameter of 250 mm and a focal length of 395 mm. Flat field of view of the telescope is 10 °. 1 nz.p. f BACKGROUND Table 2., 3-yl.