Patent ID: 8896942

Claim:
A zoom lens system 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 positive refractive power, which are arranged in an order from an object side, wherein: the first lens group comprises one or more lenses having a negative refractive power, a reflector for changing an optical path, and one or more lenses having a positive refractive power; when zooming is performed from a wide angle position to a telephoto position, the first lens group, the third lens group and the fifth lens group remain fixed and the second lens group and the fourth lens group move, and the zoom lens system satisfies: Nd> 1.94, 6.5 ≦Lt/L 2≦7.5, and 3.0≦ F 1/( Ft/Fw )≦3.9; where Nd represents an refractive index of the one or more lenses having a negative refractive power in the first lens group; Lt represents an overall length of the zoom lens system at the telephoto position; L2 represents an amount of movement of the second lens group when zooming is performed from the wide angle position to the telephoto position; F1 represents a focal length of the first lens group; Fw represents a focal length at the wide angle position of the zoom lens system; and Ft represents a focal length at the telephoto position of the zoom lens system.