Zhejiang Dahua Technology Co., Ltd.

Faguan Lin

Kai Liu

Hongxing Ding

Changtao Hu

A zoom lens is provided. The zoom lens may include in order from an object side to an image side: a first lens group; a second lens group; a third lens group; a fourth lens group; and a fifth lens group; wherein the zoom lens satisfies the following conditions: −1.7≤f/f≤−0.3, 0.7≤f/f≤2.1, 1.1≤f/f≤2.5, and TTL/f≤6.5, wherein fdenotes a focal length of the second lens group, fdenotes a focal length of the third lens group, fdenotes a focal length of the fourth lens group, fdenotes a focal length of the zoom lens, and TTL denotes a total track length of the zoom lens.

Zoom lens and optical device having the same

The present disclosure relates to zoom lenses and optical devices using the same. A zoom lens may include in order from an object side to an image side: a first lens group, a second lens group, a third lens group, a fourth lens group; and a fifth lens group. The zoom lens may satisfy the following conditions: −2.28≤f/f≤−1.08, and 0.15≤TTL/(BFL*f′)≤0.45, wherein fdenotes a focal length of the second lens group, fdenotes a focal length of the zoom lens at a wide angle end, TTL denotes a total track length of the zoom lens, and BFL denotes a back focal length of the zoom lens.

The present disclosure relates to a lens system and an imaging device including the lens system. The lens system may include a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group in sequence from an object side to an image side along an optical axis of the lens system. At least one of the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group may be adjustable along the optical axis of the lens system to adjust a focal length of the lens system. The lens system may satisfy 

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Hangzhou, China

Faguan Lin