| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high-magnification zoom lens which offers compactness, a wide angle, a large aperture ratio, and resolving power compatible with high-pixel image sensors.SOLUTION: A zoom lens comprises a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, a third lens group Ghaving positive refractive power, and a fourth lens group Ghaving positive refractive power arranged in order from the object side. When zooming from the wide angle end to the telephoto end, the second lens group G, a part of the third lens group G, and the fourth lens group Gmove along the optical axis. A high-magnification zoom lens which offers compactness, a wide angle, a large aperture ratio, and high resolving power is realized by satisfying predefined conditions.</p> |
