LARGE-APERTURE LENS Russian patent published in 2012 - IPC G02B9/62 

FIELD: physics.

SUBSTANCE: lens has two components separated by an aperture diaphragm. The first component contains a negative meniscus lens whose convex surface faces the object space, a positive biconvex lens and a negative glued lens consisting of a biconvex and a biconcave lens. The second component consists of a glued negative meniscus lens whose concave surface faces the object space and consists of a biconcave and biconvex lens, a first and a second biconvex lens. The surfaces of the first and second positive lenses of the second component facing each other are aspherical.

EFFECT: reduced size and weight of the lens while maintaining high aperture ratio, image quality, linear field of view, as well as possibility of using said lens in both digital and film cameras.

4 cl, 1 dwg, 1 app, 1 tbl