Patent ID: 8520312
Filing Date: 2013-08-27
Classification: G02B,G03B

Abstract:
1. A finder apparatus that superimposes, on an image formed by an observation optical system of a reverse-Galilean finder including an objective lens group having negative refractive power and an eyepiece lens group having positive refractive power, display on a display member arranged outside an optical path of the observation optical system by using an optical path combination member arranged between the objective lens group and the eyepiece lens group, thereby making a user observe the image on which the display is superimposed, the finder apparatus comprising: a target lens group that guides light from the display member, and which is provided in an optical path from the display member to the eyepiece lens group, wherein the following formulas (1) and (2) are satisfied: f2 is the focal length of the eyepiece lens group, and fg is a combined focal length from the target lens group through the eyepiece lens group.