Patent ID: 7912368

Claim:
An eyepiece lens system for an electronic viewfinder, the eyepiece lens system usable to be disposed on an optical axis between a LCD of the electronic viewfinder and a last optical surface of the electronic viewfinder, the eyepiece lens system comprising: a first lens having a positive refractive index; a second lens having a negative refractive index; and a third lens having a positive refractive index, wherein the first lens, the second lens, and the third lens are disposed in this order from a side of the LCD to a side of the last optical surface of the electronic viewfinder, satisfying the conditions: 18 mm<f 1 <20 mm, −18 mm<f 2 <−16 mm, 18 mm<f 3 <20 mm, 19 mm<f<21 mm, and 0≦HH′/f<+0.13 where f 1 is a focal length of the first lens, f 2 is a focal length of the second lens, f 3 is a focal length of the third lens, f is a combined focal length of the first to the third lenses, and HH′ is distance in an optical axis direction between a rear principal point H and a front principal point H′.