PHOTOGRAPHIC MACROLENS Russian patent published in 2021 - IPC G02B13/24 G02B9/34 G02B9/64 

FIELD: photographic equipment.

SUBSTANCE: lens can be used in photographic equipment. The lens contains four components, the second and third of which are separated by an aperture diaphragm. The first component is positive and contains a plane-convex lens facing the image space with a convexity. The second component is negative and contains a positive meniscus with the convexity facing the object space, and a biconcave lens. The third component is positive and contains a positive double-glued meniscus, with the concavity facing the object space and consisting of biconcave and biconvex lenses, and a single biconvex lens. The fourth component is negative and contains a positive meniscus with the concavity facing the object space, and a biconcave lens.

EFFECT: improvement in the image quality across the field and an increase in manufacturability by reducing the number of glued lenses and abandoning lenses with aspherical surfaces while maintaining the relative aperture and the magnitude of the linear field of the image.

3 cl, 3 dwg, 1 tbl