Patent ID: 7193788

Claim:
A zoom lens comprising: a first lens group with a positive refractive power; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a positive refractive power, wherein the first to fourth lens groups are arranged in this order from an object side of the zoom lens, the first lens group and the third lens group are positioned statically, the second lens group is moved to be close to an image surface side of the zoom lens for zooming the zoom lens, the fourth lens group is moved for correcting a focus movement caused by zooming the zoom lens and is further moved for focusing the zoom lens, the second lens group consists of: a negative lens in a meniscus shape whose concave surface faces the image surface side of the zoom lens; a negative lens; a positive lens; and a negative lens, and the negative lens in a meniscus shape, the negative lens, the positive lens, and the negative lens in the second lens group are arranged in this order from an objective side of the zoom lens.