Zoom lens with five lens groups
AssigneeNikon Corporation
InventorsAtsushi Shibayama, Masatoshi Suzuki, Takanori Fujita
Life of this patent
Estimating the term…
Abstract
A zoom lens is composed of a first lens group of a negative refractive power, a second lens group of a positive refractive power and a third lens group of a positive refractive power, in which, in the zooming operation from the wide angle end to the telephoto end, the distance between the first and second lens groups decreases, the distance between the second and third lens groups varies, the distance between the third and fourth lens groups increases, and the distance between the fourth and fifth lens groups decreases.
Claims11
A zoom lens comprising at least, in order from the object side, a first lens group of a negative refractive power that is closer to the object side than any other lens group of the zoom lens, a second lens group of a positive refractive power, a third lens group of a positive refractive power, a fourth lens group of a negative refractive power, and a fifth lens group of a positive refractive power, wherein, in the zooming operation from the wide angle end to the telephoto end, the distance between the first and second lens groups decreases, the distance between the second and third lens groups varies, the distance between the third and fourth lens groups increases, the distance between the fourth and fifth lens groups decreases, and the following condition is satisfied:
- 0.3<f2/f3<3
- wherein
- f2:
- focal length of the second lens group;
- and
- f3:
- focal length of the third lens group.
A zoom lens comprising at least, in order from the object side, a first lens group of a negative refractive power that is closer to the object side than any other lens group of the zoom lens, a second lens group of a positive refractive power, a third lens group of a positive refractive power, a fourth lens group of a negative refractive power, and a fifth lens group of a positive refractive power, wherein, in the zooming operation from the wide angle end to the telephoto end, the distance between the first and second lens groups decreases, the distance between the second and third lens groups increases, the distance between the third and fourth lens groups increases, and the distance between the fourth and fifth lens groups decreases.
A zoom lens comprising, in order from the object side, a first lens group of a negative refractive power that is closer to the object side than any other lens group of the zoom lens, a second lens group of a positive refractive power, a third lens group of a positive refractive power, a fourth lens group of a negative refractive power, and a fifth lens group of a positive refractive power, wherein, in the zooming operation from the wide angle end to the telephoto end, the distance between said first and second lens groups decreases, the distance between said second and third lens groups varies, the distance between said third and fourth lens groups increases, and the distance between said fourth and fifth lens groups decreases.
Dependencies are inferred from the claim text.