APOCHROMATIC OBJECTIVE Russian patent published in 2008 - IPC G02B9/28 G02B11/06 

FIELD: physics.

SUBSTANCE: apochromatic objective can be used in astronomical telescopes for visual observation and photographing. The objective consists of three components, the first of which is a single biconvex lens; the second component consists of three lenses - biconvex, biconcave and a converging meniscus; the third component consists of a biconvex and biconcave lens. All lenses are made from two types of conventional optical glass, refraction coefficients and dispersion coefficients of which satisfy the condition: 1.45<n₁<1.55, 1.65<n₂<1.75, 50<γ₁<60, 30<γ₂<40.

EFFECT: making of an apochromatic objective with high quality of image with minimum number of optical elements when using conventional optical glass for making the lenses.

5 dwg