PURPOSE: To realize an imaging lens by means of two lenses, which is long in a back focus, able to take a field angle relatively wider, bright and compact in size, in addition to making cost-down promotable by regulating the extent of value of a ratio between the center thickness of a lens at the subject side, consisting of a meniscus lens and the focal distance of a lens system as a whole, aside from two-lens constitution.
CONSTITUTION: This lens, consisting of two lenses L1 and L2, is made up of installing a stop (i) in space between the second lens L2 and a low-pass filter 2, and in this constitution, a beam of light incident along an optical axis X from the body side is imaged in an image-formation position P of a solid camera element 1. Here the first lens L1 is a meniscus lens being weak in refractive power directing a concave to the side of a subject and the second lens L2 is of lens with positive refractive power, and both lenses L1 and L2 are made of glass. In addition, these lenses satisfies a conditional expression of 0.19≤d1/f≤1.7. In this connection, d1 in this expression means center thickness of the first lens.