OPTICAL SYSTEM FOR CAMERA

摘要

PURPOSE: An optical system for a camera is provided to obtain a wide angle with the minimum number of lenses and to reduce manufacturing costs by employing plastic lenses. CONSTITUTION: A first lens(L1) has a negative refractive power and is in a meniscus shape swollen toward an object. A second lens(L2) has a negative refractive power. A third lens(L3) has a positive refractive power, and the object side of the third lens is swollen toward the object. A fourth lens(L4) has a positive refractive power, and the upper side of the fourth lens is swollen upward.