| 摘要 |
A photographing lens system includes an aperture stop, a first lens group, a second lens group, and a third lens group, in this order from the object. The first lens group includes a positive first lens element, and a negative second lens element which is cemented to or separate from the positive first lens element. The second lens group only includes a positive third lens element having an aspherical surface formed on at least one refractive surface thereof. The third lens group only includes a negative fourth lens element having an aspherical surface formed on at least one refractive surface thereof.
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