A lens assembly (1, 2) includes sequentially from an object side to an image side along an optical axis (OA1, OA2) a first lens (L11, L21), a second lens (L12, L22), a third lens (L13, L23), a fourth lens (L14, L24), a stop (ST1, ST2), a fifth lens (L15, L25), a sixth lens (L16, L26), a seventh lens (L17, L27) and an eighth lens (L18, L28). The first lens (L11, L21) is a meniscus lens with refractive power. The second lens (L12, L22) is a meniscus lens with refractive power. The third lens (L13, L23) is a biconcave lens with negative refractive power. The fourth lens (L14, L24) is a biconvex lens with positive refractive power. The fifth lens (L15, L25) is a biconvex lens with positive refractive power. The sixth lens (L16, L26) is with positive refractive power. The seventh lens (L17, L27) is with negative refractive power. The eighth lens (L18, L28) is with positive refractive power. The sixth lens (L16, L26) and the seventh lens (L17, L27) are cemented together.