| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a zooming optical system, an optical apparatus and a manufacturing method for the zooming optical system that implement both an increase in focusing speed and simplification of the focusing mechanism simultaneously by appropriately setting the positions of the focusing lens group. <P>SOLUTION: The variable magnification optical system has at least a first lens group G1 to a sixth lens group G6 which are disposed in order from an object. One of lens groups having positive refractive power (the first lens group G1 in Fig.1) is divided into at least two subgroups (front group G1F and rear group G1R in Fig.1). At least one of the subgroups is a focusing group (rear group G1R in Fig.1), and the focusing group is moved to the object side in focusing from an infinite object point to a close object point. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
