| 摘要 |
PURPOSE: A wide-angled large aperture lens system is provided to improve a distortion aberration characteristic while having a number F of 1.0. CONSTITUTION: A front grouped lens group(I) comprises: a first lens(1) containing a convex surface for an object surface while having a main-refractive power; a second lens(2) which is a meniscus lens containing a convex surface for an object surface while having a sub-refractive power; a third lens(3) which is a meniscus lens containing a convex surface for an object surface while having a sub-refractive power; a fourth lens(4) containing both concave surfaces while having a sub-refractive power; a fifth lens(5) which is a meniscus lens containing a convex upper surface while having a main-refractive power; and a sixth lens(6) containing a convex upper surface while having a main-refractive power.
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