Compact zoom lens system

A compact zoom lens system, the lens system when viewed from an object side, comprising:

• a first lens group of a negative refractive power;
• a second lens group of a positive refractive power, the second lens group comprising a first lens of a positive refractive power, a second lens of a positive refractive power, and a third lens of a negative refractive power, wherein two lenses among the first lens, the second lens, and the third lens are cemented;
• and
• a third lens group of a positive refractive power;
• wherein the first, the second, and the third lens groups move along an optical axis when zooming from a wide-angle position to a telephoto position, and the zoom lens system satisfies the following conditions:
• 19 0.8 ≤ D IIW f W ≤ 1.2 ⁢ ⁢ and ⁢ ⁢ 0.4 ≤ t II f W ⁢ f T ≤ 0.6 ;
• and
• wherein
• fw represents a total focal length at the wide-angle position,
• fT represents a total focal length at the telephoto position,
• tII represents a total thickness of the second lens group, and
• DIIW represents a distance between the second lens group and the third lens group at the wide-angle position.

A compact zoom lens system, the lens system when viewed from an object side, comprising:

• a first lens group of a negative refractive power;
• a second lens group of a positive refractive power, the second lens group comprising a first lens of a positive refractive power, a second lens of a positive refractive power, and a third lens of a negative refractive power;
• and
• a third lens group of a positive refractive power;
• wherein the first, the second, and the third lens groups move along an optical axis when zooming from a wide-angle position to a telephoto position, and the zoom lens system satisfies the following conditions:
• 22 - 0.2 ≤ L III f W ⁢ f T ≤ 0.1 , ⁢ 0.8 ≤ D IIW f W ≤ 1.2 ⁢ ⁢ and 0.4 ≤ t II f W ⁢ f T ≤ 0.6 , and
• wherein
• fw represents a total focal length at the wide-angle position,
• fT represents a total focal length at the telephoto position,
• tII represents a total thickness of the second lens group,
• DIIW represents a distance between the second lens group and the third lens group at the wide-angle position,
• LII represents an amount of movement of the second lens group from the wide-angle position to the telephoto position, and
• LIII represents an amount of movement of the third lens group from the wide-angle position to the telephoto position.