| 摘要 |
PURPOSE:To obtain a compact high performance lens of a high variable power by dividing the third positive component of three lens components of positive, negative and positive, into two positive lens components, and placing a positive lens component having a weak refractive power between the divided lens component and an image surface. CONSTITUTION:The titled zoom lens is constituted of the first and the third lens components having a positive focal distance, the second and the fourth lens components having a negative focal distance, and the fifth lens component having a weak positive refractive power which is provided between the fourth lens component and an image surface. A partial system consisting of the first and the second lens components has a negative composite focal distance, and at the time of zooming extending from a wide angle end to a telephone end, the first and the fourth lens components, and the second lens component move to the object side and the image side, respectively, an interval of the first and the second lens components, and an interval of the fourth and the fifth lens components increase, and an interval of the second and the third lens components and an interval of the third and the fourth lens components decrease. The third and the fifth lens components are fixed or moved a little, and each condition of the expressions is satisfied. In this way, a well-balanced aberration correction is executed. |
