a zoom lens system comprising a front lens group consisting of a first positive lens component , a second negative meniscus lens component , a third negative lens component and a fourth positive lens component , and a rear lens group consisting of a fifth positive lens component , a sixth positive lens component , a seventh negative lens component and an eighth positive lens component . said zoom lens system is so adapted as to perform zooming operation by varying the airspace reserved between said front and rear lens groups , and has sufficient wide - angle effect and a large zooming ratio in addition to aberrations corrected with good balance .