| 摘要 |
A photographic lens system having five lens components in which separation of a cemented lens of the second lens component of the Biometer type lens system has enabled making an aperture ratio of F/2.0, a long back focus and effective correction of various aberrations. The system comprises five lens components and five lens elements comprising a first lens component having a positive meniscus lens, a second lens component having positive meniscus lens, a third lens component having a negative meniscus lens, a fourth lens component having a negative meniscus lens and fifth lens component having a positive meniscus lens.
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