Wide-angle lens, optical device, and wide-angle lens focusing method

摘要

Providing a wide-angle lens having high optical performance, an optical apparatus using the same, and a method for focusing the wide-angle lens. The lens comprising, in order from an object, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third group G3 having positive refractive power. Upon focusing from an infinity object to a close object, the first lens group G1 is fixed, and the second lens group G2 and the third lens group G3 are moved to the object. Given conditional expressions are satisfied.