| 摘要 |
A shaking correction function-mounted zoom lens comprising, arranged sequentially from an object side, a first lens group (1) having a positive refraction power and fixed to an image surface, a second lens group (2) having a negative refraction power and delivering a variable power action by being moved along the optical axis, a diaphragm (6) fixed to the image surface, a third lens group (3) having a positive refraction power and fixed with respect to the optical axis direction at power varying and focusing, a fourth lens group (4) having a negative refraction power and fixed to the image surface, and a fifth lens group (5) having a positive refraction power and movable along the optical axis so as to keep the image surface varying by the moving of the second lens group on the optical axis and the moving of the object in a constant position from a reference surface. The entire third group can be moved in a direction vertical to the optical axis. A conditional expression, 0.035 < ||betaw.betat/Z|| < 0.075 is satisfied. betaw: magnification of the second lens group at a wide-angle end, betat: magnification of the second lens group at a telescopic end, Z: zoom ratio.
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