SMALL-SIZED PHOTOGRAPHING OPTICAL SYSTEM ACHIEVING HIGH DEFINITION

摘要

PURPOSE: A small-sized photographing optical system achieving high definition is provided to improve the performance and to simplify the structure. CONSTITUTION: A small-sized photographing optical system achieving high definition comprises an iris, a first lens group(LG1), a second lens group(LG2), a third lens group(LG3), and a fourth lens group(LG4) successively from an object side. The first lens group comprises a first lens(L1) having positive refractive force and a second lens(L2) having negative refractive force from the object side. The second lens group comprises a third lens(L3) having negative refractive force having at least one aspherical shape. The third lens group comprises a fourth lens(L4) having positive refractive force having at least one aspherical shape. The fourth lens group comprises a fifth lens(L5) having positive refractive force having at least one aspherical shape.