Zoom lens and digital camera

Abstract

The invention relates to the technical field of imaging, in particular to a zoom lens and a digital camera. The zoom lens is used for improving the depth of a field of the zoom lens, and therefore a target scene, a target close shot, a target long shot and a sharply focused image can be obtained. The zoom lens comprises a zoom set and a focusing set which are sequentially arranged from the object side to the image side, wherein the zoom set comprises a first convex and concave lens, a first biconcave lens and a first convex lens which are sequentially arranged from the object side to the image side; the convex face of the first convex and concave lens faces the object side, and the focal power of the first convex and concave lens is negative; the focal power of the first biconcave lens is negative; the convex face of the first convex lens faces the object side, and the focal power of the first convex lens is positive; the focusing set comprises a first biconvex lens, a second convex lens, a second biconcave lens, a second biconvex lens and a third biconvex lens, all of which are sequentially arranged from the object side to the image side; the focal power of the first biconvex lens is positive; the convex face of the second convex lens faces the object side, and the focal power of the second convex lens is negative; the focal power of the second biconcave lens is positive; the focal power of the second biconvex lens is positive; the focal power of the third biconvex lens is positive. The invention further discloses the digital camera comprising the zoom lens with the characteristics.

Description

technical field [0001] The invention relates to the field of imaging technology, in particular to a zoom lens and a digital camera. Background technique [0002] A zoom lens refers to a camera lens that can change the focal length within a certain range to obtain images of different sizes and different scene ranges, because it can change the shooting range by changing the focal length without changing the shooting distance, and can reduce the need to carry camera equipment. The number has been widely used. [0003] The existing common zoom lenses generally focus on the target scene clearly, but the close view in front of the target scene or the distant view behind the target scene is blurred, especially in the telephoto part; the main reason for this phenomenon is: the structural shape of the existing zoom lens , the dispersion coefficient and other parameters do not match the imaging conditions well, so that the zoom lens can only ensure that the target scene and the near ...

AI Technical Summary

Problems solved by technology

[0003] The existing common zoom lenses generally focus on the target scene clearly, but the close view in front of the target scene or the distant view behind the target scene is blurred, especially in the telephoto part; the main reason for this phenomenon is: the structural shape of the existing zoom lens , the dispersion coefficient and other parameters do not match well with the imaging conditions, so that the zoom lens can only ensure that the target scene and the near view are clear and clear at the same time, or the target scene and the distant view are clear and clear at the same time, that is, the existing zoom lens cannot obtain a large enough depth of field, so it is difficult It is difficult to ensure that the target scene, near view and distant view are clear at the same time

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