Optical imaging system

Abstract

An optical imaging system includes a first lens group, a second lens group, a third lens group, and a fourth lens group sequentially arranged in ascending numerical order along an optical axis of the optical imaging system from an object-side of the optical imaging system toward an imaging plane of the optical imaging system; and a reflective member disposed between the first lens group and the second lens group, wherein the second lens group and the fourth lens group are each configured to be movable along the optical axis, the first lens group has a positive refractive power, and the optical imaging system satisfies the conditional expression −3.5<fG1/fG2<−2, where fG1 is a focal length of the first lens group, and fG2 is a focal length of the second lens group.

Dependencies are inferred from the claim text.