HIGH-APERTURE LENS Russian patent published in 2016 - IPC G02B9/64 

FIELD: photography.

SUBSTANCE: lens consists of two components separated by aperture diaphragm. First component consists of single plane-convex lens, which convex surface faces object plane, single positive meniscus, which convex surface faces object plane, and negative meniscus, which convex surface faces object plane. Second component consists of negative meniscus, which concave surface faces object plane and glued from negative and positive menisci; positive meniscus, which concave surface faces object plane; plane-convex lens, which convex surface faces image plane and plane-convex lens, which convex surface faces object plane.

EFFECT: technical result is increase of rear section for use of lens with reflex cameras of APS-C (25 5/10×18 6/10 mm) form, high resolution of lens, while maintaining focal distance, angular field and aperture ratio of 1:1 2/10 while maintaining high image quality and improved manufacture ability.

1 cl, 5 dwg, 2 tbl