Patent ID: 6088156
Filing Date: 2000-07-11
Classification: G02B

Abstract:
A finder optical system which is formed independent of photographing optical system, comprising:an objective optical system for forming an intermediate image of an object, said objective optical system including a plurality of lens units; andan eyepiece optical system,said finder optical system having a reflecting member disposed between said objective optical system and said intermediate image,wherein one of said plurality of lens units of said objective optical system includes a correcting lens which is movably mounted along an optical axis of said finder optical system, said correcting lens being moved in accordance with a change of photographing distance from said object to perform a diopter correction of said finder optical system,each lens unit of said objective optical system exclusive of the lens unit having said correcting lens is fixed while said correcting lens is moved along the optical axis for the diopter correction, andsaid finder optical system satisfies a condition:0.1<.vertline.1000.times..alpha..sub.F /f.sub.R.sup.2 .vertline.<7.0where .alpha..sub.F is a maximum longitudinal magnification of said correcting lens and f.sub.R is a focal length of said eyepiece optical system.