FAST APOCHROMATIC LENS (VERSIONS)

FIELD: optics. ^ SUBSTANCE: according to the first version lens contains two positive components and einzel negative lens. First component contains four lenses, first of which is negative meniscus convex to object, second one is convexo-convex, third one is negative with first concave surface, fourth lens is positive with first convex surface. Second component contains three lenses; first one is negative with first concave surface, second lens is positive with second convex surface, third lens is positive with first convex surface. Einzel negative lens has first concave surface. Distance between second component and einzel negative lens does not exceed 0.2 focal lengths of lens. According to the second version second component contains four lenses, and fourth of them is negative with first concave surface. ^ EFFECT: production of fast achromatic lens with aperture ratio of 1:1.8, angular field 8.4° and high picture quality is provided. ^ 2 cl, 2 dwg