| 摘要 |
In a variable focal length optical system wherein a shift lens unit constituting a portion of the optical system can be moved in a direction substantially perpendicular to the optical axis of the optical system to thereby shift an image, the shift lens unit is driven on the basis of the focal length information of the optical system to correct any variation in image position due to the vibration of the optical system. When, for example, a focusing lens unit movable along the optical axis during focusing on a short distance object is disposed more adjacent to the object side than the shift lens unit, the required amount of drive of the shift lens unit is calculated on the basis of the focal length information and a memorized predetermined coefficient. |
