| 摘要 |
A zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power and a fourth lens unit having a weak refractive power, adapted so as to perform variation of focal length by displacing the second lens unit and the third lens unit in the directions reverse to each other along the optical axis with the first lens unit and the fourth lens unit kept fixed, and having a favorable optical performance and a total length shortened by using a small front lens component.
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