An image pickup lens for forming a subject image on an photoelectric converter of a solid-sate image pickup element, includes: an aperture stop; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power. The aperture stop and the first to fourth lenses are arranged in this order from an object side of the image pickup lens, and the image pickup lens satisfies predefined condition.

 
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> Imaging system with a lens having increased light collection efficiency and a deblurring equalizer

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