Zoom lens, and image pickup apparatus and image projection apparatus using the same

   
   

A zoom lens including, in order from an object side to an image side, a first lens unit L1 of negative refractive power, a second lens unit L2 of positive refractive power, a third lens unit L3 of negative refractive power, and a fourth lens unit L4 of positive refractive power, wherein, during variation of magnification from a wide-angle end to a telephoto end, L1 moves with a locus convex toward the image side, L2 moves toward the object side in such a way as to decrease a separation between L1 and L2, L3 moves toward the object side in such a way as to increase a separation between L2 and L3, and L4 moves toward the object side in such a way as to decrease a separation between L3 and L4, and wherein the Abbe number and refractive index of a negative lens included in L1 are appropriately set.

 
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