OPTICAL SYSTEM FOR SUPER WIDE ANGLE

摘要

PURPOSE: An optical system with the super wide angle is provided to reduce chromatic aberration by integrating the phase side of a fourth lens and the object side of a fifth lens. CONSTITUTION: A first lens(L1) includes minus refraction power. A second lens(L2) includes minus refraction power. A third lens(L3) includes plus refraction power. A fourth lens(L4) includes minus refraction power. A fifth lens and a sixth lens include plus refraction power. At least one side of a seventh lens(L7) is formed into an aspherical side with the point of inflection. The phase side of the fourth lens and the object side of the fifth lens are integrated.