Patent 7330317 was granted and assigned to Konica Minolta on February, 2008 by the United States Patent and Trademark Office.
A lens system 3 is provided with a plurality of lens units including a first lens unit 9, and has a condition changing structure 6 that is capable of changing the condition of the first lens unit 9 without changing the position of the first lens unit 9 in the direction of the optical axis x.