Zoom lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorsHiroki SAITO, Michio CHO, Toru ITO
Life of this patent
Estimating the term…
Abstract
A zoom lens substantially consists of a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged in order from the object side; that changes magnification by moving the first lens group and the second lens group; and wherein the first lens group is configured by a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, arranged in order from the object side. The zoom lens satisfies a predetermined conditional expression.
Claims19
A zoom lens substantially consisting of a first lens group having a negative refractive power and a second lens group having a positive refractive power, disposed in order from the object side, wherein:
- zooming is performed by moving the first lens group and the second lens group;
- the first lens group is substantially composed of a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power;
- the second lens group is substantially composed of four lenses;
- and
- when the focal length of the second lens from the object side in the first lens group is taken as fG12, the focal length of the entire system at the wide angle end is taken as fw the focal length of the first lens from the object side in the second lens group is taken as fG21, and the focal length of the second lens from the object side in the second lens group is taken as fG22, the zoom lens satisfies conditional expressions given below:
- the zoom lens satisfies a conditional expression given below:
- −0.04<fw/fG12<0.17 (1-3), and
- 1.3<fG21/fG22<3.0 (9).
Dependencies are inferred from the claim text.