Patent ID: 8027099

Claim:
An optical system for a camera comprising: a first lens which has a negative refractive power and has a meniscus shape convex toward an object side; a second lens which has a negative refractive power and has a convex surface toward an object side; a third lens which has a positive refractive power and has a convex surface toward an object side; and a fourth lens which has a positive refractive power and has a convex surface toward an image side, the optical system satisfying the following inequalities: 0.3 <v 3 /v 2<0.8, 0.06< f 1/ TL< 0.2, v 2 being an Abbe number of the second lens, v 3 being an Abbe number of the third lens, f 1 being an overall focal distance of the first through fourth lenses, and TL being a distance from a vertex of the object side of the first lens to an imaged plane, a measure of an optical axis direction satisfying the following inequality: 0.1< R 4/ R 3<0.4, and R 3 being a radius of curvature in the image side of the second lens, and R 4 being a radius of curvature in the object side of the second lens.