Patent ID: 7626765

Claim:
A bent zoom lens comprising: a first lens group including a front-side lens group having a negative refractive power, an optical member that bends an optical path, and a rear-side lens group having a positive refractive power; a second lens group; a third lens group; a fourth lens group; and a fifth lens group, the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group arranged in order from an object side, wherein a value of |β 5 2 ×(1−β 4w 2 )| is set to be from approximately 1.0 to 2.0, and a value of |β 5 2 ×(1−β 4T 2 )| is set to be approximately from 1.0 to 2.0, where β 4W represents an image-formation magnification of the fourth lens group at a wide-angle end when a distance to the object is infinite, β 4T represents an image-formation magnification of the fourth lens group at a telephoto end when a distance to the object is infinite; and β 5 represents an image-formation magnification of the fifth lens group when a distance to the object is infinite.