Patent ID: 8111467

Claim:
A zoom lens comprising, in order from an object side to an image plane side: a first lens group fixed to the image plane during zooming, having a positive refractive power, and including a single lens having a negative refractive power, an optical path change member for changing an optical path, and a positive lens group having a positive refractive power, which are arranged in order from the object side; a second lens group having a negative refractive power and including a negative lens group and a positive lens group which are arranged in order from the object side with an air gap; a third lens group fixed to the image plane during zooming and having a positive refractive power; and at least one lens group having a positive refractive power, wherein a lens group arranged closest to the image plane comprises a positive lens group and a negative lens group which are arranged in order from the object side with an air gap, and the zoom lens satisfies the following conditions: 1.4 <|fLG 1 /fw|< 5.8 and −4.8 <Ept/Yimg<− 2.5, wherein “fLG1” is a focal length of a lens arranged closer to the object side than the optical path change member in the first lens group, “fw” is the focal length of the overall zoom lens at a wide angle position, “Ept” is the position of an exit pupil at a telephoto position, and “Yimg” is the maximum image height on the image plane.