| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical path reflection type zoom lens that is compact and is favorable in optical performance while securing a variable power ratio. <P>SOLUTION: A zoom lens substantially has a five group constitution that includes, in order from an object side to an image side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power. The first lens group includes a reflection member having a reflection surface that reflects a light beam. During variation of magnification from a wide angle end to a telephoto end, distances between the respective lens groups are changed, a single cemented lens constituted by the third lens group including three lenses including a positive lens and a negative lens, the cemented lens has a convex refractive surface on the most object side and a convex refractive surface on the most image side, any of negative lenses in the cemented lens is a biconcave lens, and the biconcave lens is a lens having the smallest Abbe number among cemented lens components. <P>COPYRIGHT: (C)2013,JPO&INPIT |
