| 摘要 |
A photographic lens system of 5-elements comprises from the object side to the image side, a first lens element of a positive lens element having an object side surface convex to the object side, a second lens element of a negative meniscus lens element concave to the image side, a third lens element of a negative lens element having an object side surface concave to the object side, a fourth lens element of a positive meniscus lens element convex to the image side, and a fifth lens element of a positive lens element, wherein an air lens formed between the third lens element and the fourth lens element has a negative refractive power. The air lens is effective for correcting each aberrations.
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