| 摘要 |
A zoom lens system comprising, in the order from the object side, a first lens unit including a positive lens component, a second lens unit of negative refractive power including two negative lens components, a third lens unit having positive refractive power including a positive lens component, and a fourth lens unit including three or four lens components: a positive lens component, a negative lens component and one or two positive lens components. During zooming, the first and fourth lens units are fixed, and the second and third lens units are shifted in the direction of the optical axis with the distance between both units being varied for zooming and correcting the shift of the image position. This zoom lens system has a small number of lens components, and aberrations are properly corrected.
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