| 摘要 |
A large aperture retrofocus lens system is composed of first to sixth lenses arranged in this order from the object side. The first lens has a positive refracting power, the second lens has a negative refracting power, the third lens which is a meniscus lens concave toward the object side, the fourth lens has a negative refracting power, the fifth lens has a positive refracting power and the sixth lens has a positive refracting power.
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