JP2013235060A5

JP2013235060A5 -

Info

Publication number: JP2013235060A5
Application number: JP2012106033A
Authority: JP
Filing date: 2012-05-07
Publication date: 2015-06-25
Anticipated expiration: 2032-05-07

Claims

In order from the object side to the image side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, the third lens group having a positive refractive power, and a rear group including one or more lens groups. In zoom lenses where the distance between lens groups changes during zooming,
The rear group has a final lens group having a positive refractive power on the most image side, and at least the first lens group and the final lens group move during zooming, and the focal length of the entire system at the telephoto end is fT. When the back focus at the end is TBk and the focal length of the second lens group is f2,
30.0 <fT / TBk <260.0
25.0 <fT / | f2 | <45.0
A zoom lens satisfying the following conditional expression:

An aperture stop is provided between the second lens group and the third lens group, the amount of movement of the third lens group in the optical axis direction during zooming from the wide-angle end to the telephoto end is M3, and the optical axis of the aperture stop When the amount of movement in the direction is MS,
0.40 <MS / M3 <0.70
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the amount of movement of the first lens unit in the optical axis direction during zooming from the wide-angle end to the telephoto end is M1, and the amount of movement of the final lens unit in the optical axis direction is MF,
−55.0 <M1 / MF <−6.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the lateral magnification of the final lens group at the wide-angle end is βFW and the lateral magnification of the final lens group at the telephoto end is βFT,
0.60 <βFW / βFT <1.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the entire system at the wide angle end is fW and the focal length of the first lens group is f1,
20.0 <f1 / fW <30.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the third lens group is f3,
9.0 <fT / f3 <25.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the final lens group is fF,
6.0 <fT / fF <13.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The zoom lens according to claim 1, wherein the rear group includes a fourth lens group having a positive refractive power.

8. The rear group includes, in order from the object side to the image side, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power. The zoom lens according to item.

When the focal length of the final lens group is fF and the focal length of the fourth lens group is f4,
0.050 <fF / f4 <0.50
The zoom lens according to claim 9, wherein the following conditional expression is satisfied.

8. The rear group includes, in order from the object side to the image side, a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power. The zoom lens according to item.

When the focal length of the fourth lens group is f4,
−0.80 <fF / f4 <−0.40
The zoom lens according to claim 11, wherein the following conditional expression is satisfied.

The zoom lens according to any one of claims 1 to 12 , wherein the final lens group moves during focusing from an object at infinity to an object at a short distance.

The zoom lens according to any one of claims 9 to 12 , wherein the fourth lens group and the fifth lens group move during focusing from an object at infinity to an object at a short distance .

The zoom lens according to any one of claims 9 to 12 , wherein the fourth lens group moves during focusing from an object at infinity to an object at a short distance .

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.