| 摘要 |
PROBLEM TO BE SOLVED: To provide a zooming optical system, an optical apparatus and a manufacturing method for the zooming optical system that increase focusing speed and simplify a focusing mechanism simultaneously by properly setting the positions of a focusing lens group. SOLUTION: The zooming optical system has at least a first lens group G1 to a fifth lens group G5 which are disposed in order from an object. The first lens group G1 has positive refractive power, and is divided into at least two subgroups (front group G1F and rear grout G1R in FIG. 1). One of the subgroups is a focusing lens group (rear group G1R in FIG.1). The subgroup other than the focusing lens group (front group G1F in FIG.1), out of the subgroups, is fixed, upon focusing from an infinite object point to a close object point. COPYRIGHT: (C)2011,JPO&INPIT |
