JP2006078964A5 - - Google Patents

Claims (11)

In order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens group having a positive refractive power, and a rear group are formed. In the zoom lens in which the lens group on the most image side is a lens group having a positive refractive power, and the first , second, and third lens groups move during zooming,
The most image-side lens group in the rear group has an Abbe number of νd and a partial dispersion ratio of θgf.
νd> 75
0.53 <θgf <0.545
A positive lens that satisfies the following conditions:
When the focal lengths at the wide-angle end and the telephoto end of the entire system are fw and ft, respectively, and the focal length of the second lens group is f2.
1.1 <| f2 / fw | <1.8
ft / fw> 4.0
A zoom lens characterized by satisfying the following conditions:   The zoom lens according to claim 1, wherein the rear group includes a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power in order from the object side to the image side.   The zoom lens according to claim 1, wherein the rear group includes a fourth lens group having a positive refractive power.   During zooming, the second lens group moves to the image side at the telephoto end compared to the wide-angle end, and the third lens group moves to be positioned on the object side at the telephoto end compared to the wide-angle end. The zoom lens according to claim 1, 2 or 3. When zooming from the wide-angle end to the telephoto end, the maximum movement amount in the optical axis direction of the third lens group is M3.
0.1 <| M3 | / fw <1.0
The zoom lens according to claim 1, wherein the following condition is satisfied. During zooming from the wide-angle end to the telephoto end, when the maximum moving amount of the optical axis of the first lens group and M1,
1.1 <| M1 | / fw <2.5
The zoom lens according to claim 1, wherein the following condition is satisfied.   7. The zoom lens according to claim 1, wherein the most image side lens group in the rear group is a lens group that moves during focusing.   8. The zoom lens according to claim 1, further comprising an aperture stop that moves integrally with the third lens group during zooming. 9. When the focal length of the most image side lens unit in the rear group is fR,
2.0 <fR / fw <4.8
The zoom lens according to claim 1, wherein the following condition is satisfied. The zoom lens according to any one of claims 1 7, characterized in that the optical system for forming an image on a solid-state image element.   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that receives an image formed by the zoom lens.