Lens assembly

A lens assembly, comprising:

• an aperture, wherein a spherical lens and an aspheric lens are disposed between the aperture and the image plane of the lens assembly;
• at least two lenses are disposed between the aperture and the object side of the lens assembly;
• the quantity of the lenses with a refractive power is greater than 6 but less than 12;
• DL is the distance, in a direction perpendicular to an optical axis, between two edge turning points at the two ends of the optical axis of a lens surface with a refractive power closest to the image plane of the lens assembly;
• LT is the length on the optical axis of the lens 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,
• wherein the lens assembly satisfies the following conditions:
• 6 mm<DL<20 mm, 0.3<DL/LT<0.6.