CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] | 16 Claims |
1. An optical imaging system comprising:
a first lens comprising positive refractive power;
a second lens comprising negative refractive power;
a third lens comprising positive refractive power;
a fourth lens comprising negative refractive power and a convex object-side surface;
a fifth lens comprising positive refractive power;
a sixth lens comprising a refractive power; and
a seventh lens comprising negative refractive power,
wherein the first to seventh lenses are sequentially disposed in ascending numerical order from an object side of the optical imaging system toward an imaging plane of the optical imaging system, and
−5.0<f2/f<−2.0, where f is a focal length of the optical imaging system, and f2 is a focal length of the second lens.
|