| 摘要 |
PURPOSE: A photographing optical system is provided to obtain an image with high resolution and clearness. CONSTITUTION: A first lens(L1) has positive refractive power. Both sides(1,2) of the first lens are convex. A second lens(L2) has negative refractive power. Both sides(3,4) of the second lens are concave. A third lens(L3) has positive refractive power and a meniscus shape. A fourth lens(L4) has negative refractive power. Both sides of the fourth lens are concave. |
