| 摘要 |
<p>A zoom lens (10) has a first lens group (12) , a second lens group (14) and a third lens group (16) . The first lens group relays an outside scene to an intermediate plane. The second lens group varies magnification of the relayed image from the first lens group. Also, the second lens group includes at least one diffractive optical element. The third lens group compensates for focus shift and focuses the wavefront onto the viewing plane. <IMAGE></p> |
