| 摘要 |
A large aperture photographic lens system comprising six components of seven lenses wherein flare due to coma at intermediate field angles has been eliminated by so adapting as to satisfy the following conditions: }(1) 0.9 < r11/r9 < 1.05 , r9 > 0.55f }(2) 0.95 < d8/d10 < 1.25 }(3) 1 < r5/r4 < 1.3 }(4) 0.03f < d4 < 0.05f }(5) n1, n2, n5, n6, n7 > 1.
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