Patent ID: 6278544
Filing Date: 2001-08-21
Classification: G02B

Abstract:
A real-image zoom finder optical system in which a condenser lens system leads a bundle of rays carrying an object image formed by an objective lens system to an eyepiece lens system, and along an optical path from said objective lens system to said eyepiece lens system, an erecting optical system erects said image formed by said objective lens system; and said objective lens system, said condenser lens system, said erecting optical system and said eyepiece lens system are arranged in this order from said object;wherein said objective lens system comprises a negative lens group and a positive lens group, in this order from said object, and said negative and positive lens groups are movable along the optical axis upon zooming;wherein said negative lens group comprises a negative meniscus single lens element having a convex surface facing towards said object, and a meniscus single lens element having a convex surface facing towards said image, in this order from said object; andwherein said condenser lens system comprises at least one positive lens element and a negative single lens element having a concave surface facing towards said object.