Zoom lens, video enlarging/projecting system, video projector, rear projector, and multivision system

摘要

The present invention includes three or more lens groups. These are arranged in the order of a first lens group ( 11 ) that has positive refractive power and a second lens group ( 12 ) that has negative refractive power, as seen from the side having the longer conjugate distance, wherein a first lens ( 12 a) of the lenses of the second lens group ( 12 ), as seen from the side having the longer conjugate distance, has positive refractive power. Thus, it is possible to suppress distortion aberration to a small value.