Patent ID: 8824061
Filing Date: 2014-09-02
Classification: G02B

Abstract:
1. A zoom lens consisting of: a first lens group having positive refractive power, and which is fixed during changing magnification and during focusing; a second lens group having negative refractive power, and which is moved during changing magnification; a third lens group having positive refractive power, and which is fixed during changing magnification and during focusing; a fourth lens group having positive refractive power, and which is moved during changing magnification and during focusing; and a fifth lens group having negative refractive power, and which is moved during changing magnification, which are in this order from an object side, and wherein a lens group constituting the first lens group consists of a front group having negative refractive power and a rear group having positive refractive power in this order from the object side, and wherein the second lens group consists of four lenses of a negative lens, a positive lens, a negative lens, and a positive lens arranged in this order from the object side, or consists of four lenses of a negative lens, a positive lens, a negative lens, and a negative lens arranged in this order from the object side.