| 摘要 |
A camera includes a zoom lens having a first lens group having a positive focal length, a second lens group having a negative focal length, an opening iris, a third lens group having a positive focal length, and a fourth lens group having a positive focal length. The first lens group, the second lens group, the opening iris, the third lens group and the fourth lens group are arranged in order from the object side, When zooming from a short focal point end toward a long focal point end, the second lens group moves from the object side toward the image side, and the third lens group first moves from the image side toward the object side, and then, after arriving at a position closest to the object side in an area at a long focal point side beyond an intermediate focal point, moves toward the image side.
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