Zoom lens

1. A zoom lens comprising:

a first lens group located adjacent to a object side and having a total negative refractive power; and

a second lens group located adjacent to a image side and having a total positive refractive power,

wherein zooming occurs as a interval between the first lens group ad the second lens group is varied,

wherein the zoom lens satisfies

-

4

<

f

⁢

⁢

1

Zr

<

-

0.5

,

where f 1 denotes a focal distance of the first lens group, and Zr denotes a ratio of a focal distance at a telephoto position to a focal distance at a wide angle position (ft/fw),

wherein the first lens group comprises, sequentially from the object side to the image side: a first lens and a second lens,

wherein the second lens group comprises, from the object side to the image side: an iris, a third lens, a fourth lens, a fifth lens, and a sixth lens,

wherein at least one surface of the fourth lens is an aspheric surface.

2. The zoom lens according to claim 1 , wherein the first lens has a convex surface facing the object side ad negative refractive power, ad the second lens has a convex surface facing the object side ad positive refractive power.

3. The zoom lens according to claim 1 , wherein at least one surface of the second lens is a aspheric surface.

4. The zoom lens according to claim 1 , wherein the first lens group comprises a negative lens having a convex surface facing the object side.

5. The zoom lens according to claim 1 , wherein the second lens group comprises a positive lens having a convex surface facing the object side, and wherein at least one positive lens of the second lens group has an aspheric surface.

6. The zoom lens according to claim 1 , wherein the iris is located in front of the third lens at the object side.

7. The zoom lens according to claim 1 , wherein the third lens, the fourth lens and the sixth lens have convex surfaces facing the object side and positive refractive power, and the fifth lens has a concave surface facing the image side and negative refractive power.

8. The zoom lens according to claim 1 , wherein at least one surface of the sixth lens is an aspheric surface.

9. The zoom lens according to claim 1 , wherein the zoom lens satisfies

-

1

<

f

⁢

⁢

1

ttlw

<

-

0.15

,

where f 1 denotes the focal distance of the first lens group, and ttlw denotes total length of the wide angle position.

10. A zoom lens comprising:

a first lens group located adjacent to an object side and having a total negative refractive power; and

a second lens group located adjacent to an image side and having a total positive refractive power,

wherein zooming occurs as an interval between the first lens group and the second lens group is varied,

wherein the zoom lens satisfies

-

1

<

f

⁢

⁢

1

ttlw

<

-

0.15

,

where f 1 denotes a focal distance of the first lens group, and ttlw denotes total length of a wide angle position,

wherein the first lens group comprises, sequentially from the object side to the image side: a first lens and a second lens,

wherein the second lens group comprises, from the object side to the image side: an iris, a third lens, a fourth lens, a fifth lens, and a sixth lens,

wherein at least one surface of the fourth lens is an aspheric surface.

11. The zoom lens according to claim 10 , wherein the first lens has a convex surface facing the object side and negative refractive power, and the second lens has a convex surface facing the object side and positive refractive power.

12. The zoom lens according to claim 10 , wherein at least one surface of the second lens is an aspheric surface.

13. The zoom lens according to claim 10 , wherein the first lens group comprises a negative lens having a convex surface facing the object side.

14. The zoom lens according to claim 10 , wherein at least one positive lens of the second lens group has an aspheric surface.

15. The zoom lens according to claim 10 , wherein the third lens, the fourth lens and the sixth lens have convex surfaces facing the object side and positive refractive power, and the fifth lens has a concave surface facing the image side and negative refractive power.

16. The zoom lens according to claim 10 , wherein the iris is located in front of the third lens at the object side.

17. The zoom lens according to claim 10 , wherein at least one surface of the sixth lens is an aspheric surface.