Patent ID: 6154314
Filing Date: 2000-11-28
Classification: G02B

Abstract:
A real mode variable magnification finder comprising, in order from an object side:an objective optical system with positive power, including at least three lens units;an image erecting system; andan ocular optical system with positive power, said finder satisfying the following conditions:0.1.gtoreq..beta..sub.W Z/D.sub.W .gtoreq.0.08013.5 mm.ltoreq.f.sub.R .ltoreq.17.3 mmwhere .beta..sub.W is a magnification at a wide-angle position of said finder, Z is a variable magnification ratio of said finder, D.sub.W is an axial distance, in millimeters from an object-side surface of a first lens unit of said objective optical system to a pupil-side surface of a third lens unit thereof at the wide-angle position of said finder, and f.sub.R is a focal length of said ocular optical system of said finder.