| 摘要 |
PROBLEM TO BE SOLVED: To obtain a zoom lens having a compact optical system, with less deterioration in optical performance caused by manufacturing errors, such as the relative offset of an optical axis of respective lenses, and also, capable of obtaining good image quality, even when shake correction (shake prevention) is carried out. SOLUTION: The zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear lens unit Lr including one or more lens units and having an overall positive refractive power. Zooming is carried out by changing an interval between respective lens units. The third lens unit includes, in order from the object side, a first subunit L3a having a positive refractive power, an aperture stop, a second subunit L3b. The lens configuration and refractive power arrangement of each of the first subunit and the second subunit of the third lens unit are appropriately set. COPYRIGHT: (C)2009,JPO&INPIT
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