The embodiments of the invention disclose a large-aperture optical
system. The large-aperture optical
system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are sequentially distributed from an object plane to an
image plane along an
optical axis; the
image plane side of the first lens is a
concave surface; the focal power of the first lens is negative; the object plane side of the second lens is a convex surface, the
image plane side of the second lens is a
concave surface, and the focal power of the second lens is negative; the object plane side of the third lens is a convex surface, the image plane side of the third lens is
concave surface, and the focal power of the third lens is positive; the object plane side of the fourth lensis a convex surface, the image plane side of the fourth lens is a convex surface, and the focal power of the fourth lens is positive; the object plane side of the fifth lens is a concave surface, theimage plane side of the fifth lens is a convex surface, and the focal power of the fifth lens is negative; and the object plane side of the sixth lens is a convex surface, and the focal power of the sixth lens is positive. The embodiments of the present invention further provide an image
pickup module set. The optical
system and the image
pickup module set of the embodiments of the invention eachare mainly composed of 6 lenses; and since the number of the lenses is small, and the structures of the optical system and the image
pickup module set are both simple. The different lenses are combined with one another, and focal power is properly distributed, and therefore, the optical system and the image pickup module set have good performance such as
large aperture, large viewing angle and high pixel, and are suitable for the vehicle-mounted imaging field.