Wide-angle lens, image pickup apparatus, and a wide-angle lens and focusing methods

摘要

PPROBLEM TO BE SOLVED: To provide a wide angle lens which is a compact type, nevertheless, hardly causes aberration change upon focusing, has high optical performance and has reduced ghost and flare. PSOLUTION: The wide angle lens WL is configured such that a first lens group G1 is fixed upon the focusing from an infinite object to a near object, a second lens group G2 moves along an optical axis, an anti-reflective film is disposed on at least one surface of optical surfaces in the first lens group G1 and the anti-reflective film includes at least one layer formed by using a wet process. PCOPYRIGHT: (C)2009,JPO&INPIT