| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a small zoom lens which has a high variable power ratio and excellent optical performance. <P>SOLUTION: The zoom lens includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a positive refractive power. When magnification is changed from a wide angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 is changed, a distance between the second lens group G2 and the third lens group G3 is changed, and the fourth lens group G4 is temporarily moved to an object side and then moved to an image side. The third lens group G3 includes a first positive lens L31, a negative lens L32, and a second positive lens L33. The fourth lens group G4 includes two lenses L41 and L42. <P>COPYRIGHT: (C)2013,JPO&INPIT |
