Patent ID: 8467134
Filing Date: 2013-06-18
Classification: G02B

Abstract:
1. A zoom lens comprising: a first lens group having a negative refractive power, and comprises two negative lenses and one positive lens; a second lens group having a positive refractive power; a third lens group having a positive refractive power and comprising one piece of positive lens; and a fourth lens group having a negative refractive power, wherein the first, second, third, and fourth lens groups are sequentially disposed in an order from an object side to an image surface side of the zoom lens, all distances between adjacent lens groups change and the third lens group performs focusing while zooming from a wide angle position to a telephoto position, and a following condition is satisfied: wherein L 23W denotes a distance between a lens surface of the image surface side of the second lens group and a lens surface of the object side of the third lens group in the wide angle position, and L 23T denotes a distance between a lens surface of the image surface side of the second lens group and a lens surface of the object side of the third lens group in the telephoto position.