| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a compact inner focus lens which offers superior imaging performance, has a focal length that allows the lens to be used as a standard lens, and can be used for shooting videos.SOLUTION: The inner focus lens comprises a first lens group Gwhich includes an aperture stop S and has positive refractive power, a second lens group Ghaving negative refractive power, and a third lens group Ghaving positive refractive power arranged in order from the object side. The inner focus lens adjusts focus by moving the second lens group Galong the optical axis. The third lens group Gincludes a positive lens Lwhich functions as an anti-vibration group. A compact inner focus lens which offers superior imaging performance and can be used as a standard lens even for shooting videos can be realized by satisfying predetermined conditions.</p> |
