Patent ID: 8169719

Claim:
A lens system comprising: in order from an object side to an image side, a first lens made of glass, the first lens having positive refractive power and a meniscus shape with a convex surface facing the object side; an aperture stop; a second lens made of glass, the second lens having positive refractive power and a meniscus shape with a convex surface facing the image side; and a third lens made of resin, the third lens having positive refractive power and a convex surface facing the object side, wherein the lens system satisfies the following conditional formulae (1) and (2): f 2 /f<− 3.5, and (1) 3.5 <f 3 /f≦ 4.99, (2) where f is a focal length of the entire lens system; f2 is a focal length of the second lens; and f3 is a focal length of the third lens.