Title:
レンズ系及び光学装置
Document Type and Number:
Japanese Patent JP5636668
Kind Code:
B2
Abstract:
A lens system comprising, in order from an object side: a first lens group G1; and a second lens group G2 having positive refractive power; the first lens group G1 including a sub-lens group GS11 having positive refractive power, and a sub-lens group GS12 having negative refractive power, the sub-lens group GS12 having negative refractive power including a meniscus lens having a convex surface facing the object side, given conditions being satisfied: an antireflection coating being formed on at least one optical surface in the first lens group G1 and the second lens group G2, and the antireflection coating including at least one layer formed by a wet-process, thereby providing a lens system having high optical performance with excellently correcting various aberrations and suppressing ghost images and flare, and an optical apparatus equipped therewith.
Inventors:
田中 一政
小濱 昭彦
小濱 昭彦
Application Number:
JP2009272048A
Publication Date:
December 10, 2014
Filing Date:
November 30, 2009
Export Citation:
Assignee:
株式会社ニコン
International Classes:
G02B13/00; G02B1/11; G02B1/111
Attorney, Agent or Firm:
Yoshio Inoue
Ken-ichi Aihara
Ken-ichi Aihara