| 摘要 |
A small-sized zoom lens suitable for use where a place for installing a zoom lens is limited and having a magnification ratio of about 4.5 or above and excellent image forming performance. The zoom lens consists of, in order from the object side along the optical axis, a first lens group G1 having positive refractive power and equipped with an optical element for bending an optical path, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having positive refractive power. When the focal length varies from a wide angle end state W to a tele end state T, the first lens group G1 and the third lens group G3 are fixed against an image plane and the second lens group G2, the fourth lens group G4, and the fifth lens group G5 move individually.
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