| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a zoom lens which has excellent shake correction function by achieving miniaturization and weight saving of an anti-vibration group as well as reduction in an anti-vibration shift amount of the anti-vibration group while maintaining high optical performance. <P>SOLUTION: A zoom lens comprises: a first lens group G<SB POS="POST">11</SB>having positive refractive power; a second lens group G<SB POS="POST">12</SB>having negative refractive power; a third lens group G<SB POS="POST">13</SB>having positive refractive power; and a fourth lens group G<SB POS="POST">14</SB>having positive refractive power, in this order from an object side. The fourth lens group G<SB POS="POST">14</SB>has: a front group G<SB POS="POST">14</SB>(F) having positive refractive power; a middle group G<SB POS="POST">14</SB>(M) which is constituted by a cemented lens including a positive lens and a negative lens, and which has negative refractive power as a whole; and a rear group G<SB POS="POST">14</SB>(R) having positive refractive power, in this order from the object side. A shake correction (anti-vibration) is performed by shifting the middle group G<SB POS="POST">14</SB>(M) in a direction almost orthogonal to an optical axis. <P>COPYRIGHT: (C)2012,JPO&INPIT |
