Optical imaging system, camera device, and hand-held data terminal device

An optical imaging system, comprising:

• a first lens group having a positive or negative optical power, an aperture diaphragm, and a second lens group having a positive optical power arranged in order from an object side, wherein
• the first lens group is comprised of a first front lens group including at least two negative lenses and a first rear lens group having at least one positive lens with an airspace in-between the first front and rear lens groups, the airspace being largest among airspaces in the first lens group;
• the second lens group is comprised of a second front lens group including a first positive lens, a first negative lens, a second negative lens, and a second positive lens arranged in order from the object side, and a second rear lens group including at least one aspherical lens;
• when focusing on an object in a close range from infinity, the second lens group is configured to move to the object side;
• and
• the first and second lens groups are configured to move in such a manner as to satisfy the following condition when focusing on an object at infinity:
• 0.3<D—S2/D—1S<2.0
• where D—1S is an interval between the first lens group and the aperture diaphragm and D—2S is an interval between the second lens group and the aperture diaphragm.