Patent ID: 6411783
Filing Date: 2002-06-25
Classification: G03B

Abstract:
A finder unit comprising:a finder optical system having an objective optical system for forming a viewing image and an eyepiece optical system for viewing said viewing image, and including an inverting optical system for making the viewing image formed by said objective optical system an erecting normal image; a first optical component which forms a part of said objective optical system and which is provided closer to said objective optical system such that it is distant from an image formation position for said viewing image by a predetermined length; and a second optical component which forms a part of said eyepiece optical system and which is provided closer to said eyepiece optical system such that it is distant from the image formation position for said viewing image by a predetermined length; wherein the condition expressed by 8<1000Ã—(D1+D2)/f2(1/m) â€ƒis satisfied, where f (mm) represents a focal length of said eyepiece optical system, D1 (mm) represents a distance from the image formation position for said viewing image to an optical surface of said first optical component closer to the image formation position for said viewing image, and D2 (mm) represents a distance from the image formation position for said viewing image to an optical surface of said second optical component closer to the image formation position for said viewing image.