Optical lens including five lenses of −−+−+, −−+++ or −−+−+, or six lenses of −−−+−+ or −−++−+ refractive powers

An optical lens, comprising:

• a first lens group comprising three lenses with refractive powers, two of the three lenses of the first lens group being made from glass, and the three lenses comprising a spherical lens and an aspheric lens;
• a second lens group having a positive refractive power and comprising two lenses with refractive powers, and the two lenses comprising an aspheric lens;
• and
• an aperture stop disposed between the first lens group and the second lens group, wherein a total number of lenses in the optical lens is less than 9, and the optical lens satisfies the conditions:
• 0.2<DL/LT<0.38;
• and
• 0.05<EFL/LT<0.1, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, EFL is an effective focal length of the optical lens, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens,
• wherein the optical lens comprises, in order from a magnified side to a minified side, a meniscus lens, an aspheric lens, an aspheric lens, a bi-convex lens and an aspheric lens.

An optical lens, comprising:

• a first lens group comprising three lenses with refractive powers, two of the three lenses of the first lens group being made from glass, and the three lenses comprising a spherical lens and an aspheric lens;
• a second lens group having a positive refractive power and comprising two lenses with refractive powers, and the two lenses comprising an aspheric lens;
• and
• an aperture stop disposed between the first lens group and the second lens group, wherein a total number of lenses in the optical lens is less than 9, and the optical lens satisfies the conditions:
• 0.2<DL/LT<0.38;
• and
• 0.05<EFL/LT<0.1, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, EFL is an effective focal length of the optical lens, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens,
• wherein the optical lens has six lenses with refractive powers of negative, negative, negative, positive, negative and positive.