| 摘要 |
An improved zoom lens system includes at least three lens groups which are arranged, in order from the object side, as a first lens group having a positive focal length, a second lens group having a positive focal length and a third lens group having a negative focal length. When zooming is carried out from the wide angle to the telephoto end, the first, second and third lens group are all moved towards the object so that the distance between the first and second lens groups increases whereas the distance between the second and third lens groups decreases. The first lens group has a first lens element with a concave lens surface on the side the closest to object while satisfying specific conditions.
|
