| 摘要 |
PURPOSE:To obtain high variable megnification and also compact high performance, by constituting so that a titled lens is provided with the first lens group being diverging, the second lens group being converging and moving to only one direction, and the third lens group being diverging from an object side, and a specified conditional equation is satisfied. CONSTITUTION:A titled lens is provided with the first lens group being diverging, the second lens group being converging, and the third lens group being diverging from an object side, executes zooming by moving these three lens groups, and its second lens group is constituted so as to move to only one direction. Also, this lens is constituted so that the conditional equationsIand II are satisfied, when distances to an image surface from the respective positions of a wide- angle end and a telephoto end of the second lens group, a focal distance of the second lens group, distances to the image surface from the respective positions of a wide-angle end and a telephoto end of third lens group, and a focal distance of the third lens group are denoted as bW and bT, f2, CW and CT, and f3, respectively, and in case of t2=bT-bW and t3=CT-CW. |
