Optical system

Abstract

An optical system includes an object lens group, an erector lens group, and an eyepiece group. The object lens group, the erector lens group, and the eyepiece group are arranged in order form an object side to an image side along an optical axis. The object lens group includes a first lens, a second lens, a third lens, a fourth lens, and an optical element. The optical element is disposed between the second lens and the third lens or the optical element is disposed between the third lens and the fourth lens. A light guide surface of the optical element can be rotated, moved, or tilted relative to the optical axis. The first lens is with refractive power and includes a convex surface facing the object side. The second lens, the third lens, and the fourth lens are with refractive power. The eyepiece group includes a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The fifth lens includes a concave surface facing the object side. The sixth lens includes a convex surface facing the image side. The seventh lens includes a convex surface facing the object side. The eighth lens includes a convex surface facing the object side.

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