Zoom lens

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 f1 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.