CPC G02B 15/144 (2019.08) | 14 Claims |
1. A zoom lens group, sequentially from an object side to an image side of the zoom lens group along an optical axis, comprising:
a first lens group;
a second lens group;
a third lens group having positive refractive power; and
a fourth lens group having negative refractive power;
wherein the zoom lens group continuously zooms by changing positions of the second lens group, the third lens group, and the fourth lens group along the optical axis,
wherein a distance TTL from an object-side surface of a lens in the first lens group closest to the object side to an imaging plane of the zoom lens group along the optical axis, and a total effective focal length fw of the zoom lens group in a wide-angle state satisfy:
2.0<TTL/fw<3.0.
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