OBJECTIVE LENS WITH OFFSET ENTRANCE PUPIL Russian patent published in 2016 - IPC G02B9/60 

FIELD: physics.

SUBSTANCE: lens consists of five separate lenses on a beam path, the first of which is a positive meniscus facing the object with its concave side, the second is a positive meniscus facing the object with its concave side, the third is a positive meniscus facing the object with its concave side, the fourth is a biconvex lens and the fifth is a negative meniscus facing the image with its convex side. The radii of the spherical surfaces, which are the first on the beam path, of the first three lenses increase in magnitude. The radii of the spherical surfaces, which are the second on the beam path, of the first three lenses increase in magnitude.

EFFECT: longer focal distance and back focal distance with high technological effectiveness, while maintaining high image quality.

2 cl, 1 dwg, 3 tbl