FAST LENS Russian patent published in 2020 - IPC G02B9/34 G02B13/18 

FIELD: optics; data processing.

SUBSTANCE: lens can be used in digital sighting devices with megapixel CCD or CMOS matrices in day and night conditions. Lens has two components, the first of which comprises a biconvex lens and a convex-concave lens which faces the object with its concave side, the second one – a biconvex lens, the second surface of which is an aspherical, biconvex and biconcave lens. Biconvex and biconcave lenses of the second component are glued together. Aperture diaphragm is located on the second surface of the negative lens of the first component. Following ratios are met: 1.5<|F₂/F_L|<2.5, 1.2<|F₃/F_L|<1.9, where F_L focal length of the lens; F₂ – focal distance of second lens of first component; F₃ is focal distance of second component first lens.

EFFECT: increasing the luminosity of lens to 1:1 and providing image quality at spatial frequencies of up to 130 g/mm.

1 cl, 1 dwg, 1 tbl