| 摘要 |
[Problem] To achieve higher performance, higher magnification, wider angle, lower cost and the acquisition of more favorable images for a zoom lens. [Solution] A zoom lens comprises, in order from an object side, a positive first lens group (G1), a negative second lens group (G2), a positive third lens group (G3), and a positive fourth lens group (G4). When zooming from a wide-angle end to a telephoto end, the first lens group (G1) and the third lens group (G3) are fixed in the optical axis direction, the second lens group (G2) moves toward the image side, and the fourth lens group (G4) moves in the optical axis direction. The first lens group (G1) comprises, in order from the object side, a cemented lens constituted by a negative lens and a positive lens, and two positive lenses. The third lens group (G3) comprises, in order from the object side, a fixed front group (G3f) and a rear group (G3r), the rear group (G3r) having a positive refractive power and allowing for the shift of a reduction-side image by shifting in a direction intersecting with the optical axis. |
