OBJECTIVE Russian patent published in 2009 - IPC G02B9/34 

FIELD: physics.

SUBSTANCE: invention can be used, particularly, in television cameras working with a receiving matrix. The objective consists of four single lenses on a course of beams: the first - plano-convex lens, the second - positive meniscus lens turned to the image by concavity, the third - biconcave lens, the fourth - convexo-convex lens. The optical filter and one or several plane-parallel plates, and one or several prisms can be located behind the fourth lens. The objective can work as well as a collimator in beam return. Ratios between the design data specified in the invention formula are carried out in the objective.

EFFECT: focal distance increase, image quality increase at high technology.

1 dwg