Abstract: At least one exemplary embodiment is directed to a zoom lens which includes, in order from an object side to an image side, a first lens unit with a negative refractive power, a second lens unit with a positive refractive power, and a third lens unit with a negative refractive power. The second and third lens units move during zooming. The first lens unit includes a negative biconcave lens element. The zoom lens satisfies the following conditions: ?1.4<?1/?w<?1.0 0.9<?2/?w<1.4 ?1.3<?3/?w<?0.9 where ?1 is a refractive power of the first lens unit, ?2 is a refractive power of the second lens unit, ?3 is a refractive power of the third lens unit, and ?w is a refractive power of the entire system at a wide-angle end.

Abstract: At least one exemplary embodiment is directed to a zoom lens which includes, in order from an object side to an image side, a first lens unit, which can have a negative refractive power; a second lens unit, which can have a positive refractive power; and a third lens unit, which can have a negative refractive power. The second and third lens units can move in zooming. The first, second, and, third lens units can satisfy the following conditions: 1.2<|?1/?T|<2 0.9<?2/?T<2.2 0.75<?3/?1<1.2 wherein ?1, ?2, and ?3 are the refractive powers of the first, second, and third lens units, respectively, and ?T is the refractive power of the zoom lens at a telephoto end.

Abstract: At least one exemplary embodiment is directed to a zoom lens which includes, in order from an object side to an image side, a first lens unit with a negative refractive power, a second lens unit with a positive refractive power, and a third lens unit with a negative refractive power. The second and third lens units move during zooming. The first lens unit includes a negative biconcave lens element. The zoom lens satisfies the following conditions: ?1.4<?1/?w<?1.0 0.9<?2/?w<1.4 ?1.3<?3/?w<?0.9 where ?1 is a refractive power of the first lens unit, ?2 is a refractive power of the second lens unit, ?3 is a refractive power of the third lens unit, and ?w is a refractive power of the entire system at a wide-angle end.

Abstract: At least one exemplary embodiment is directed to a zoom lens which includes, in order from an object side to an image side, a first lens unit, which can have a negative refractive power; a second lens unit, which can have a positive refractive power; and a third lens unit, which can have a negative refractive power. The second and third lens units can move in zooming. The first, second, and, third lens units can satisfy the following conditions: 1.2<|?1/?T|<2 0.9<?2/?T<2.2 0.75<?3/?1<1.2 wherein ?1, ?2, and ?3 are the refractive powers of the first, second, and third lens units, respectively, and ?T is the refractive power of the zoom lens at a telephoto end.