6p lens suitable for small mounting hole

A 6P lens suitable for small mounting hole, comprising an aperture stop, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object side to an image side;

• the first lens is a positive lens, wherein its object surface is convex at a near optical axis and changes from a convex surface to a concave surface from the near optical axis to the periphery, its image surface is concave at the near optical axis and changes from the concave surface to the convex surface from the near optical axis to the periphery;
• the second lens is a negative lens, wherein its object surface is convex and its image surface is concave;
• the third lens is a positive lens, wherein its object surface is concave and its image surface is convex;
• the fourth lens is a negative lens, wherein its object surface is concave and its image surface is convex;
• the fifth lens is a positive lens, wherein its object surface is concave and its image surface is convex, and the fifth lens is generally curved toward the object side;
• the sixth lens is a negative lens, wherein its object surface is a concave surface and its image surface is convex, and the larger radial dimensions of both surfaces of the sixth lens are curved toward the object side.