ZOOM LENS, VIDEO ENLARGING/PROJECTING SYSTEM, VIDEO PROJECTOR, REAR PROJECTOR, AND MULTIVISION SYSTEM

摘要

A zoom lens having three or more groups of lenses. When viewed from the long conjugate distance side, a first lens group (11) having a positive refractive power and a second lens group (12) having a negative refractive power are arranged in order of mention. Among the lenses of the second lens group (12), the first lens (12a) from the long conjugate distance side has a positive refractive power. With this, the distortion aberration is reduced to a low level.