Lens assembly

A lens assembly, comprising:

• a combined lens, wherein the combined lens is formed of two lenses and comprises corresponding adjacent surfaces whose radii of curvature are substantially identical;
• a spherical lens and an aspheric lens, wherein the aspheric lens is closer to the image plane of the lens assembly than the combined lens;
• at most one lens is disposed between the aspheric lens and the image plane of the lens assembly;
• more than 3 but less than 8 lenses with a refractive power, wherein D1 is the distance between two edge turning points on a lens surface farthest away from the image plane of the lens assembly;
• DL is the distance between two edge turning points on a lens surface closest to the image plane of the lens assembly;
• LT is the length on an optical axis of the lens assembly from the lens surface farthest from the image plane of the lens assembly to the lens surface closest to the image plane of the lens assembly;
• and
• wherein the lens assembly satisfies the following conditions:
• (1) 6 mm<DL<20 mm, 1.5<LT/DL<2.4 and D1/DL>0.6 or (2) 6 mm<DL<20 mm, 1.25<LT/DL<1.7 and D1/DL>0.4.