OBJECTIVE Russian patent published in 2008 - IPC G02B9/34 G02B11/20 

FIELD: optical devices.

SUBSTANCE: proposed objective comprises four components, located on an optical axis. The first component is a positive two-bonded lens, consisting of a biconvex lens and a negative meniscus. The second component is a negative meniscus, made from biconvex and biconcave lenses glued together. The third component is a biconcave lens and the fourth is a negative meniscus, whose concave surface faces the objects. Between the third and fourth components, there is spectrum-dividing unit. The fourth component can move along the optical axis and is optically linked to the edge of the spectrum-dividing unit, which seprates the 575 nm ...850 nm spectrum range. The distance between the third and fourth components along the optical axis is not less than 0.6 of the focal distance of the objective. The total focal power of all components does not exceed 0.0014 mm^-1. The refractive index of the glass of the lenses of the third and fourth components does not exceed 1.6.

EFFECT: higher quality of the image.

6 dwg