Optical imaging system

An optical imaging system comprising:

• a first lens having a positive refractive power, a convex object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof;
• a second lens having a negative refractive power;
• a third lens having a negative refractive power;
• a fourth lens having a refractive power;
• a fifth lens having a negative refractive power;
• and
• a sixth lens having a positive refractive power, a concave object-side surface in a paraxial region thereof, and a convex image-side surface in a paraxial region thereof,
• wherein the first to sixth lenses are sequentially disposed on an optical axis from an object side toward an image side,
• wherein the optical imaging system has a total of six lenses, and
• wherein FOV≤44° is satisfied, where FOV is a field of view of the optical imaging system.