| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner focus lens which has a large diameter and is capable of acceleration of a focus speed and correction of image blur, and an interchangeable lens device and a camera system.SOLUTION: An inner focus lens includes a first lens group, an aperture diaphragm, and a second lens group in this order from an object side. The first lens group includes a first sub lens group in a position nearest to the object side. The first sub lens group includes a positive first lens element, a positive second lens element, and a negative third lens element, or a positive first lens element, a positive second lens element, a positive third lens element, and a negative fourth lens element. One lens element in the second lens group moves relative to an image surface in focusing. The second lens group includes five or more of lens elements and has, within the second lens group, a negative lens element, a positive lens element, and a positive lens element in this order from the object side. There are also provided an interchangeable lens device and a camera system. |
