Four group zoom lens system

摘要

A zoom lens system including a first lens group of a positive refractive power having two lenses which moves linearly toward an object for a magnification change; a second lens group of a negative refractive power at least having one lens of a negative refractive power and one lens of a positive refractive power adhered thereto; a third lens group of a positive refractive power which moves non-linearly toward the object for a magnification changes; and a fourth lens group of a negative refractive power which moves linearly toward the object for a magnification change.