Optical lens

The invention discloses an optical lens. The invention relates to a multi-lens zoom lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive or negative focal power, a fourth lens with positive focal power, a fifth lens with positive or negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power, the first lens is a convex-concave lens; the second lens is a concave-convex lens or a lens with a concave image side surface; the third lens is a lens with a concave image side surface; the fourth lens and the seventh lens are both biconvex lenses. The fifth lens is a concave-convex lens; the sixth lens is a lens with a convex image side surface; the eighth lens is a lens with a concave object side surface; the ninth lens is a concave-convex lens or a lens with a convex object-side surface. 本发明的一种光学镜头，依次包括