| 摘要 |
PURPOSE:To obtain a distortion image lens system suitable, specially, for plate making and copying by composing the attachment lens of two negative and positive cylindrical lens group while a proper air gap is left. CONSTITUTION:This attachment consists of the negative cylindrical lens group and positive cylindrical lens group from an object side and satisfies an equation mainly, thereby obtaining the anamorphic attachment lens with an about 0.7-0.9 deformation rate. In the equation, f1 and DELTA1 are the focal length and principal point interval of the negative cylindrical lens group and f2 and DELTA2 are the focal length and principal point interval of the positive cylindrical lens group; and DELTA is the distance between principal points of both cylindrical lens groups, (m) is power (m>0), and D and D' are the overall length and air-converted length of the attachment lens. |
