| 摘要 |
Teleobjective-type of zoom, having four lens groups and rear focusing and comprising a first lens group which is positive and fixed during zooming and focusing, a second lens group which is negative and moves for zooming, an aperture stop, a third lens group which is positive and fixed during zooming and focusing and a fourth lens group which is positive and moving for zooming and focusing.
The first lens group is formed of a negative lens, a right-angle prism and two positive lenses and fulfils a set of inequalities.
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