Real image type variable power finder

Abstract

A real image type variable power finder includes an objective lens system, an ocular lens system, a condenser lens, and an image erecting optical system. The objective lens system includes a first lens group having a negative power and a second lens group having a positive power in this order from the object side, so that the two lens groups being removed to vary the magnification. The second lens group has a negative lens and a positive lens in this order from the object side. The variable power finder satisfies the relationships: (1) 2.5<f.sub.E /f.sub.S <4.0; (2) -0.7<f.sub.S /f.sub.1 <-0.3 (f.sub.1 <0); (3) 0.4<f.sub.S /f.sub.2 <0.8; and (4) -0.3<f.sub.S /f.sub.2-1 <-0.05 (f.sub.2-1 <0); wherein "f.sub.E " designates the focal length of the ocular optical system, "f.sub.S " the effective focal length of a lens system including the objective lens system and the condenser lens on the short focal length side, "f.sub.1 " the focal length of the first lens group of the objective lens system, "f.sub.2 " the focal length of the second lens group of the objective lens system, and "f.sub.2-1 " the focal length of the negative lens of the second lens group of the objective lens system, respectively.

Dependencies are inferred from the claim text.