| 摘要 |
PURPOSE: A zoom lens system is provided to have a small F number and a wide viewing angle while showing a high definition at the central part and the peripheral part. CONSTITUTION: A first lens group(G1) has a negative refractive power. A second lens group(G2) has a positive refractive power. Fnow is greater than 1.2, and smaller than 2.2. ft/fw is greater than 2.5, and smaller than 3. [Reference numerals] (AA) Wide-angle band; (BB) Intermediate band; (CC) Telescopic band
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