Imaging lens

A compound imaging lens comprising:

• a first lens, a second lens, and a third lens disposed sequentially in this order, the first lens disposed toward an object, and the third lens disposed toward an image surface;
• wherein
• the first lens has a meniscus shape, a positive refraction, and a convex surface, the convex surface facing the object;
• the second lens has a meniscus shape and a concave surface, the concave surface facing the object;
• the third lens has a convex-type surface facing the object, and a concave-type aspherical surface facing the image surface, the concave-type aspherical surface configured to provide a negative refraction in a radially central portion and a positive refraction in a radially peripheral portion;
• and
• a condition
• 0.016<Δ/f<0.018 (1)
• is satisfied, where
• Δ is defined as an absolute value of longitudinal chromatic aberrations at Fraunhofer F curve and C curve wavelengths, and
• f is defined as a combined focal distance of the entire compound imaging lens.