Patent ID: 9417430
Filing Date: 2016-08-16
CPC Classification: G02B,G03B

Claim Text:
1. An inner focus lens system, in order from an object side to an image side, comprising a first lens unit, and subsequent lens units, wherein the first lens unit is fixed with respect to an image surface in focusing from an infinity in-focus condition to a close-object in-focus condition, the first lens unit includes: a first positive lens element being located closest to the object side, and having positive optical power; and a second positive lens element having positive optical power, the subsequent lens units include only a first focusing lens unit located closest to the object side, and a second focusing lens unit, as focusing lens units that move along an optical axis in the focusing, at least one of the first focusing lens unit and the second focusing lens unit is composed of two or less lens elements, and the subsequent lens units include an image blur compensating lens unit that moves in a direction perpendicular to the optical axis to optically compensate image blur.