TELEOBJECTIVE Russian patent published in 2007 - IPC G02B13/02 G02B9/06 

FIELD: optics.

SUBSTANCE: teleobjective consists of two components serially positioned along the direction of beams from object, first one of which consists of two glued lenses - biconvex one and concave-flat negative one, and second component - negative meniscus, facing the object with its concave part, an optical refraction element with flat surfaces is located behind the second component. In teleobjective, certain ratios, defined in invention, are maintained between value of air space between first and second components, thickness of third lens, total length of optical beam drive in optical refraction element with flat surface, focus distance of objective, radiuses of first, second, fourth and fifth optical surfaces and refraction coefficients and dispersion coefficients for line D of material of first and second lenses.

EFFECT: decreased shortening coefficient of teleobjective, decreased ratio of objective length to focus distance, increased ratio of back focal length to focus distance, increased manufacturability with high image quality.

5 cl, 1 dwg