| 摘要 |
An object is to provide a high-resolution zoom lens system which has fewer lens elements and therefore, can be retracted into a compact form when not in use; and the zoom lens system, in order from the object side, comprises a first lens unit G 1 having negative power, a second lens unit G 2 having positive power and a third lens unit G 3 having positive power, wherein magnification is varied with change in intervals between each lens unit by independently moving each lens unit along an optical axis, in which the first lens unit G 1 comprises one negative lens element L 1 and one positive lens element L 2 , the second lens unit G 2 comprises only a cemented lens element having set of three lens elements L 3 , L 4 and L 5 which are cemented with each other, and the third lens unit G 3 comprises one positive lens element L 6.
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