| 摘要 |
A zoom lens system used for an imaging device for a fixed-lens camera etc. The zoom lens system includes at least the following lens groups sequentially arranged from the object side: a 1st lens group (GR1) with positive refractive power, a 2nd lens group (GR2) with negative refractive power, a 3rd lens group (GR3) with positive refractive power, a 4th lens group (GR4) with negative refractive power, a 5th lens group (GR5) with positive refractive power, and a 6th lens group (GR6) with negative refractive power. Magnification is varied by varying the intervals between the lens groups. The zoom lens system satisfies the following expressions of (1), (2), (3), (4), and (5): (1) DW(1-2) DT(2-3) (3) DW(3-4) > DT(3-4) (4) DW(4-5) < DT(4-5) (5) DW(5-6) < DT(5-6) Where, in the above, DW(i-j) is the distance between an i-th lens group and a j-th lens group at the wide angle end in infinity shooting and DT(i-j) is the distance between the i-th lens group and the j-th lens group at the tele end in infinity shooting, and focusing is made when the 4th lens group (GR4) is moved in the optical axis direction.
|
