Abstract: An optical imaging system includes a first lens including a positive refractive power, a concave object-side surface, and a convex image-side surface. The optical imaging system also includes a second lens including a positive refractive power, a convex object-side surface, and a concave image-side surface. The optical imaging system further includes a third lens, a fourth lens, and a fifth lens. The first to fifth lenses are sequentially disposed from an object side to an image side.

Abstract: An optical imaging system includes five lenses in which a first lens includes a positive refractive power and a concave object-side surface, and a second lens includes a positive refractive power and a concave image-side surface. The first to fifth lenses are sequentially disposed from an object side to an image side.

Abstract: An optical imaging system includes a first lens including a positive refractive power, a concave object-side surface, and a convex image-side surface. The optical imaging system also includes a second lens including a positive refractive power, a convex object-side surface, and a concave image-side surface. The optical imaging system further includes a third lens, a fourth lens, and a fifth lens. The first to fifth lenses are sequentially disposed from an object side to an image side.

Abstract: An optical imaging system includes a first lens comprising a positive refractive power, and a concave object-side surface, a second lens comprising a positive refractive power, a third lens comprising a negative refractive power, a fourth lens comprising a positive refractive power, and a fifth lens comprising a positive refractive power, a concave image-side surface. The first through fifth lenses are sequentially disposed from an object side toward an imaging plane.

Abstract: An optical imaging system includes a first lens, as second lens, a third lens, a fourth lens, and a fifth lens. The first lens includes a positive refractive power and a convex image-side surface. The second lens includes a positive refractive power, and the third lens includes a negative refractive power. The fourth lens includes a positive refractive power, and the fifth lens includes a positive refractive power. The first to fifth lenses are sequentially disposed from an object side toward an imaging plane.

Abstract: There is provided an optical imaging system including a prism, a first fixed lens group, a first movable lens group, a second movable lens group, and a second fixed lens group. The prism is configured to refract light reflected from an object side toward an imaging plane and a reflecting member. The prism is disposed on the first fixed lens group and the first movable lens group is configured to change a position of the imaging plane so that an overall focal length is changed. The second movable lens group is configured to adjust a position of the imaging plane so that a focal length for an object is adjusted. The imaging plane is disposed on the second fixed lens group.