| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high-magnification zoom lens which achieves both compactness and a low price.SOLUTION: A zoom lens comprises a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G4 having positive refractive power, and achieves a predefined zoom ratio by moving all the lens groups back and forth along an optical axis direction in varying magnification. The second lens group has a negative meniscus lens 21 having a convex surface on the object side, a negative lens 22, and a negative lens 24 which is located closest to the image side and has a concave surface on the object side, while the fourth lens group includes at least two positive lenses 42, 44 and a negative lens 43, and the two lens groups satisfy conditional expressions (1) and (2).</p> |
