Compact zoom lens

A compact zoom lens, comprising:

• a lens assembly including a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from the object side;
• said first lens group including at least one negative lens component and at least one positive lens component in order from the object side, said negative lens component consisting of a negative meniscus lens and a negative lens;
• said second lens group including at least a positive lens component, a negative lens, and another positive lens in order from the object side;
• said second lens group being movable from the image side to the object side when the focal length of the whole lens system is varied from its wide-angle position to the telephoto position;
• and
• said compact zoom lens satisfying the following conditions:
• 0.7<f.sub.2 /F.sub.W <1.4
• -1.7<f.sub.1 /F.sub.W <-1.0
• 0.07<.vertline..O slashed..sub.1 /R.sub.1 -.O slashed..sub.2 /R.sub.2 .vertline.<0.9
• where f.sub.1 is the focal length of the first lens group, f.sub.2 is the focal length of the second lens group, F.sub.W is the focal length of the entire lens system at the wide-angle end, .O slashed..sub.1 is the effective radius of the object-side lens surface of said negative meniscus lens, .O slashed..sub.2 is the effective radius of the image-side lens surface of said negative meniscus lens, R.sub.1 is the radius of curvature of the object-side lens surface of said negative meniscus lens, and R.sub.2 is the radius of curvature of the image-side lens surface of said negative meniscus lens.

A compact zoom lens, comprising:

• a lens assembly including a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from the object side;
• said first lens group including at least one negative lens component and at least one positive lens component in order from the object side;
• said second lens group including at least a positive lens component, a negative lens, and another positive lens in order from the object side, the positive lens component of the second lens group consisting of a first positive lens and a second positive lens;
• and
• said second lens group being movable from the image side to the object side when the focal length of the whole lens system is varied from its wide-angle position to the telephoto position;
• the compact zoom lens satisfying the following conditions:
• 0.7<f.sub.2 /F.sub.W <1.4
• -1.7<f.sub.1 /F.sub.W <-1.0
• -3<q<0
• where f.sub.1 is the focal length of the first lens group, f.sub.2 is the focal length of the second lens group, F.sub.W is the focal length of the entire lens system at the wide-angle end, and q is the shape factor of the negative lens of the second lens group.