REFLECTING LENS OF TELESCOPE Russian patent published in 1994 - IPC

FIELD: manufacture of telescopes. SUBSTANCE: telescope lens includes primary concave and secondary convex spherical reflectors and third concave reflector which surface is deposited on backing common with primary one. In this case group including primary and secondary reflectors is imparted with negative optical power. Third reflector is imparted with optical power 1.5-2 times exceeding optical power of primary reflector which is given shape of hyperboloid with retouched surface. Surface of third reflector may also be retouched and aperture diaphragm may be integrated with secondary reflector. EFFECT: improved stability of operational characteristics. 3 cl, 5 dwg