Zoom lens system

A zoom lens system comprising in order from an object side of the lens system:

• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein at least one of a fifth and an eighth lens surface has an aspherical surface, the fifth and eighth lens surfaces being counted from the object side and wherein the first, second and third lens groups are arranged to satisfy an inequality:
• 0.37<f.sub.2 /f.sub.3 <0.44 f.sub.2 >0,f.sub.3 >0
• wherein f.sub.2 is a focal length of the second lens group in the zoom lens system and f.sub.3 is the focal length of the third lens group in the zoom lens system.

A zoom lens system comprising in order from an object side of the lens system:

• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein at least one of a fifth and an eighth lens surface has an aspherical surface, the fifth and eighth lens surfaces being counted from the object side and wherein the first, second and third lens groups are arranged to satisfy an inequality:
• 1.52<.vertline.m(2T).vertline.<1.74 m(2T)<0
• wherein m (2T) is a magnification of the second lens group in the zoom lens system at a tele position.

A zoom lens system comprising in order from an object side of the lens system:

• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein
• the second lens group includes five lenses and the first, second and third lens groups are arranged to emit light rays which are substantially parallel to each other and substantially perpendicular to a receiving surface upon which the light rays are impinged.

A zoom lens system comprising, in order from an object side of the zoom lens system:

• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein
• each of the first, second and third lens groups are movable from a first position when the zoom lens system is in a wide position to a second position when the zoom lens system is in a tele position and the third lens group is arranged and constructed such that the third lens group moves from the first position in a direction toward the object side first to a mean position and then to the second position when the zoom lens system is moved from the wide position to the tele position and the third lens group moves from the second position in a direction toward an image surface first to the mean position and then to the first position when the zoom lens system is moved from the tele position to the wide position, wherein a location of the third lens group at the mean position is located closer to the object side than a location of the third lens group at the tele position and at the wide position.

A zoom lens system for use in a camera having a color filter and a CCD, the zoom lens system comprising in order from an object side of the lens system:

• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein
• each of a fifth and an eighth lens surface has an aspherical surface, the fifth and eighth lens surfaces being counted from the object side, the second lens group includes five lenses, each of the first, second and third lens groups is movable from a first position when the lens system is in a wide position to a second position when the lens system is in a tele position.

A camera comprising:

• a color filter;
• a CCD;
• and
• a zoom lens system including in order from an object side of the lens system:
• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein
• the second lens group includes five lenses and the first, second and third lens groups are arranged to emit light rays which are substantially parallel to each other and substantially perpendicular to a receiving surface upon which the light rays are impinged.

A camera comprising:

• a color filter;
• a CCD;
• and
• a zoom lens system including, in order from an object side of the lens system:
• a first lens group having a negative refracting power;
• a second lens group spaced from the first lens group and having a positive refracting power;
• and
• a third lens group spaced from the second lens group and having a positive refracting power;
• wherein
• each of the first, second and third lens groups are movable from a first position when the zoom lens system is in a wide position to a second position when the zoom lens system is in a tele position and the third lens group is arranged and constructed such that the third lens group moves from the first position in a direction toward the object side first to a mean position and then to the second position when the zoom lens system is moved form the wide position to the tele position and the third lens group moves from the second position in a direction toward an image surface first to the mean position and then to the first position when the zoom lens system is moved from the tele position to the wide position, wherein a location of the third lens group at the mean position is located closer to the object side than a location of the third lens group at the first position and at the second position.