Patent ID: 7773310
Filing Date: 2010-08-10
Classification: G02B

Abstract:
1. A zoom lens comprising: a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power in that order from the object side, wherein zooming is performed by moving the second lens group and the fourth lens group in an optical-axis direction, wherein the first lens group includes a front lens group having a negative refractive power, an optical member for bending an optical path, and a rear lens group having a positive refractive power in that order from the object side, and wherein the front lens group is a cemented lens in which a first lens having a negative refractive power is bonded to a second lens having a positive refractive power in that order from the object side to the image side.