| 摘要 |
A zoom viewfinder substantially consists of, in order from the object side: a variable-magnification objective lens system substantially consisting of a first lens group that includes a negative first-group first lens and a reflective member arranged in this order from the object side, a positive second lens group that is moved during magnification change, and a positive third lens group that is moved during magnification change; an erect optical system having a reflective surface for converting an inverted image into an erect image; and a positive eyepiece lens system, wherein conditional expressions (1), (2A) and (3) below are satisfied: 1.5<U2/U1<3.0 (1), 1.76≰|f2/f1|<2.0 (2A) and 1.0<f3/f2<5.0 (3). |
