| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform high-speed focusing while assuring downsizing. <P>SOLUTION: An imaging lens includes, in order from an object side to an image side: a first lens group having a negative refractive power and fixed; a second lens group having a positive refractive power; a diaphragm; a third lens group comprising a cemented lens; a fourth lens group comprising a positive lens; a fifth lens group comprising a negative lens serving as a focusing lens group; and a sixth lens group comprising a positive lens. Thus, since the fifth lens group comprising a single lens is moved in the optical axis direction as a focusing lens group, the weight of a lens group which performs focusing is small, thereby allowing high-speed focusing while assuring downsizing. <P>COPYRIGHT: (C)2013,JPO&INPIT |
