Patent Number: 7,133,221

Title: Lens system and optical device having the same

Abstract: A lens system has a plurality of lenses, a stop, and a diffractive surface, the entire lens system moves during focusing, and the lens system satisfies the condition of .beta..gtoreq.0.5, where .beta. is a maximum photographic magnification.

Inventors: Harada; Akria (Tochigi, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G02B 9/14 (20060101)

Expiration Date: 2019-11-07 0:00:00