An embodiment of the invention discloses a low-
distortion wide-angle optical
system which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lensfrom an object surface to an image surface along an
optical axis. An object surface side of the first lens is a convex surface, an image surface side of the first lens is a
concave surface, and the first lens has
positive power. An object surface side of the second lens is a convex surface, an image surface side of the second lens is a
concave surface, and the second lens has
negative power. An object surface side of the third lens is a convex surface, an image surface side of the third lens is a
concave surface, and the third lens has
positive power. An object surface side of the fourth lensis a convex surface, an image surface side of the fourth lens is a convex surface, and the fourth lens has
positive power. An object surface side of the fifth lens is a concave surface, an image surface side of the fifth lens is a plane, and the fifth lens has
negative power. An object surface side of the sixth lens is a convex surface, an image surface side of the sixth lens is a convex surface,and the sixth lens has
negative power. The
system mainly comprises six lenses, the number of the lenses is small, the
system is simple in structure, integrally miniaturized and applicable to the field of
aerial photo monitoring and the like, and has good optical properties such as wide angles, high pixels and
low distortion by mutually combining different lenses.