| 摘要 |
A lens assembly comprises an aperture and a lens group consisting of a first, a second, a third, and a fourth lens element. The first lens element is a bi-convex lens element disposed at the front side of the lens assembly. The second lens element is a bi-concave lens element. The third lens element is a meniscus lens element with its convexity facing the rear side of the lens assembly, and the fourth lens element is a bi-convex lens element disposed at the rear end of the lens assembly. The aperture is disposed on the front side of the first lens element.
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