| 摘要 |
The telephoto lens is in each case put together from two different lens systems, a front group and a focusing group. The object-side front groups have fixedly arranged lens elements or lens element groups and the image-side focusing groups have mutually displaceable lens elements or lens element groups. The focal lengths of the focusing groups are chosen such that with the front groups, they produce telephoto lenses of different overall focal lengths. The front groups can be combined in a modular manner with the focusing groups. Telephoto lenses having excellent imaging performances can be put together with reduced production expenditure. The numerical data of a number of lens parts are specified.
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