PANCRATIC OPTICAL SIGHT Russian patent published in 2013 - IPC G02B23/10 F41G1/38 

FIELD: physics.

SUBSTANCE: sight has, arranged in series on a beam path, a three-element objective lens, an aiming reticle, a two-component pancratic system, an ocular consisting of a plane-concave lens, a single positive meniscus and a negative meniscus and a biconvex lens glued together, a mechanism for moving the reticle, which enables to separately make height and lateral direction adjustments. The objective lens consists of two menisci glued together - a positive meniscus whose concave surface faces the object and a negative meniscus, and a third biconvex lens. The dispersion coefficient v_c of the first and third lenses satisfies the condition 50<v_c<70, which is 2-2.5 times greater than the dispersion coefficient of material of the second element of the lens. The following relationships are satisfied: f_gl=(5-6) f'_ob, f'₁=(1.2-1.4)f'_ob, f'₂=(1-1.5)f'_ob, f'₃=(1-1.5) f'_ob, where f'_gl, f'_ob, f'₁, f'₂, f'₃ are the focal distances of the glued lens, the objective lens, the first positive meniscus, the second negative meniscus and the third biconvex lens. The aiming reticle is in form of three thin sharp metal strips, and the twilight factor varies from 10.8 to 18.7.

EFFECT: high accuracy of aiming, simple design and low weight, size and cost, ensuring stealthiness of aiming.

1 dwg, 1 tbl