| 摘要 |
An improved 5-component, 5-lens element inverted telephoto objective lens system is provided comprising from object to image side of a negative meniscus single lens element, a biconvex single lens element, a biconcave single lens element, a positive meniscus single lens element and a positive single lens element. The lens system fulfills the following conditions: -(1) N1 > 1.69 -(2) 0.72(d6 + d7 + d8 + d9) < d5 < 2.2(d6 + d7 + d8 + d9) -(3) 0.26 f < d4 < 0.43 f -(4) 0.14 f < d5 < 0.3 f -(5) 1.51 f < f2 + ¦f3¦ < 2.2 f -(6) 0.12 f < d3 < 0.4 f -(7) 0.92 f < r3 < 2.0 f -(8) 1.71 f < -r4 < 4.0 f -
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