Abstract: An optical imaging system includes a first lens having positive refractive power, a second lens, a third lens, a fourth lens, and a fifth lens, arranged in order from an object side. The first lens is shaped such that a length of a first axis, which intersects an optical axis, is greater than a length of a second axis, which intersects the optical axis and is perpendicular to the first axis. The optical imaging system satisfies 4.5<TTL/IMG HT<6.5; 0.87<TTL/f<1.31; and 0.65<L1S1es/L1S1el<0.9.

Abstract: An optical imaging system includes a first lens having positive refractive power, a second lens, a third lens, a fourth lens, and a fifth lens, arranged in order from an object side. The first lens is shaped such that a length of a first axis, which intersects an optical axis, is greater than a length of a second axis, which intersects the optical axis and is perpendicular to the first axis. The optical imaging system satisfies 4.5<TTL/IMG HT<6.5; 0.87<TTL/f<1.31; and 0.65<L1S1es/L1S1el<0.9.

Abstract: An imaging lens system is provided. The imaging lens system includes a first lens having refractive power, a second lens having refractive power, a third lens having refractive power, a fourth lens having refractive power and a concave image side surface, a fifth lens having refractive power and a concave object side surface, a sixth lens having refractive power, a seventh lens having refractive power, and an eighth lens having refractive power. The first to eighth lenses of the imaging system are sequentially arranged from an object side to an imaging side, and, in the imaging lens system, TTL/2ImgHT < 0.6, where TTL is a distance from an object side surface of the first lens to an imaging plane, and 2ImgHT is a diagonal length of the imaging plane.

Abstract: An optical imaging system includes a lens group including at least one lens forming a first optical axis; and an optical path converter reflecting light emitted from the lens group to form an image on an imaging plane. In the optical imaging system, a maximum distance from an object side surface of a frontmost lens, disposed closest to an object side, among the lens group, to the imaging plane, in a first optical axis direction is 11.0 mm or less.

Abstract: An optical imaging system includes a first lens having positive refractive power, a second lens, a third lens, a fourth lens, and a fifth lens, arranged in order from an object side. The first lens is shaped such that a length of a first axis, which intersects an optical axis, is greater than a length of a second axis, which intersects the optical axis and is perpendicular to the first axis. The optical imaging system satisfies 4.5<TTL/IMG HT<6.5; 0.87<TTL/f<1.31; and 0.65<L1S1es/L1S1el<0.9.