OBJECTIVE Russian patent published in 2005 - IPC

FIELD: optics.

SUBSTANCE: the objective consists of successively located on the optical axis first component including a positive meniscus turned by the convexity to the object, double-glued meniscus containing a biconvex and biconcave lenses, and a negative meniscus turned by the convexity to the object, and the second component consisting of a single biconvex lens. The focal powers of the components relate as 3.5 ≤ f^{`</sup> <sub>1comp</sub>/ f<sup>`} _2comp ≤ 4, where f^{`</sup> <sub>1comp</sub>, f<sup>`} _2comp - the focal lengths of the first and second components. The effective distance between the components equals 0.2 ≤ d_eff.comp ≤ 0.22, where d_eff.comp= d_comp /f^`,d_comp- the distance between the components, f- objective focal length.

EFFECT: provided an increase of the field of vision, and enhanced quality of image due to the reduced spherical aberration, meridian curvature and sagittal curvature.

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