SIGHT WITH VARIABLE MAGNIFICATION Russian patent published in 2009 - IPC G02B23/10 F41G1/38 G02B17/08 

FIELD: physics, optics.

SUBSTANCE: sight comprises objective, collective positive lens with grid applied onto its flat surface, pancratic turning system comprising two positive components and ocular. Objective is made of positive convexo-convex lens and negative meniscus arranged at d distance from it and inverted with its concavity to positive lens. Mirror coat is applied on central part of convex surface of negative meniscus. Behind negative meniscus there is a spherical mirror with opening in central part at distance D from objective. Spherical mirror is inverted with its concavity to negative meniscus of objective, and D>10d. Behind mirror there is negative concavo-concave lens introduced, being glued of positive meniscus and concavo-concave negative lens.

EFFECT: provision of variable magnification of high zoom factor 12,5^X-50^X with insignificant increase in longitudinal dimensions and weight and achievement of resolution limit in the center of angular visual field at maximum magnification of not more than 3" at ratio of magnification variation equal to 4.

2 dwg