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

FIELD: physics.

SUBSTANCE: sight has a series-arranged two-component lens whose components are positive lenses glued from two lenses, a grid, a two-component erecting system, between the components of which, in form of positive lenses glued from two lenses, there is a beam splitting cube, an additional positive component glued from two lenses and lying over the cube, three flat mirrors and an eyepiece. The beam splitting cube, the additional positive component and the three flat mirrors form a second channel through which the shooter can see a magnified image of the target on the lower part of the field of view. The objective lens includes two glued lenses, the first of which is positive and the second is negative and movable along an axis. The aperture diaphragm is located on the first surface of the third lens of the objective lens. The first glued positive lens of the objective lens consists of a positive lens and a negative lens. The second glued negative lens of the objective lens consists of a negative lens and a positive meniscus. Refraction indices of the first and second lenses of the first and second components of the objective lens are pairwise identical. The distance between the glued lenses of the objective lens and the grid and the focal distances of the lenses of the objective lens correspond to expressions given in the claim.

EFFECT: enabling aiming and firing at both long and very short distances with adjustments to the ballistics of firing at a chosen distance.

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