| 摘要 |
Disclosed herein is a zoom lens, including: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power; the first, second, third and fourth lens groups being disposed in order from the object side; the first lens group including only a cemented lens including a positive lens and a negative lens cemented in order from the object side and having a generally positive refracting power; the first lens group being configured so as to satisfy the conditional expression (25<nud11-nud12<50) where nud11 is the Abbe number of the positive lens of the first lens group and nud12 is the Abbe number of the negative lens of the first lens group.
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