| 摘要 |
A three-group zoom lens, includes, in order from an object side thereof: a first lens group having a negative refractive power, including in order from the object side: a negative-power first lens; and a positive-power second lens, wherein the first lens group including at least one aspherical surface, a second lens group having a positive refractive power, including in order from the object side thereof, a positive-power first lens; a positive-power second lens; and a negative-power third lens; wherein the positive-power second lens and the negative-power third lens are cemented together to form a meniscus-shaped cemented lens that faces a convex surface to the object side and the second lens group has aspherical surfaces on at least two surfaces other than a cemented surface of the cemented lens; and a third lens group having a positive refractive power, including: a positive-power single lens having only a spherical surface.
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