| 摘要 |
A image pick-up lens system includes: a first lens with positive diffractive power, a second lens with negative diffractive power, a third lens with positive diffractive power, and a fourth lens with negative diffractive power. The first lens, the second lens, the third lens and the fourth lens are aligned in that order from an object side to an image side, and each of the four lenses is an aspheric lens made from a plastic material.
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