Wide-angle lens system and imaging apparatus employing the same

A wide-angle lens system comprising, in an order from an object side toward an image surface side:

• a first lens group having refractive power;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power,
• wherein, when an object position changes from an infinite distance to a nearest distance, the first and third lens groups are fixed, and only the second lens group moves along an optical axis to perform focusing, and
• wherein the second lens group consists of a lens having positive refractive power, a lens having negative refractive power, and a lens having positive refractive power, in an order from the object side toward the image surface side,
• wherein the wide-angle lens system satisfies the following condition:
• 1.48≦Fno≦2.02,
• 3.5≦Fno*OAL/Y<6.5,
• wherein Fno denotes a F-number during a full-opening, OAL denotes a distance between a first surface of the wide-angle lens system closest to the object side and an image surface, and Y denotes a paraxial image height.