| 摘要 |
A high performance large aperture ratio telephoto lens system having a focal length of 200 mm to 300 mm, aperture ratio of 1:2.0 and low telephoto ratio and comprising a first converging lens group, a diverging lens group and a second converging lens group; said first converging lens group consisting of three positive, positive and negative lens components, said diverging lens group consisting of three lens components, i.e., a positive meniscus lens component, a negative meniscus lens component and a negative cemented doublet, and said second converging lens group comprising at least a cemented doublet consisting of a negative element and a positive element.
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