| 摘要 |
A Gauss type photographic lens comprises, in succession from the object side, a first group including a positive lens component, a second group including a positive lens and a negative lens and having a negative refractive power as a whole, a third group including a meniscus lens component comprising a negative lens and a positive lens cemented together and having its concave surface facing the object side, and a fourth group including a positive lens component. The lens component in said fourth group is movable along the optical axis and the focusing is accomplished only by movement of said movable lens.
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