Patent ID: 7710661

Claim:
An optical apparatus comprising: in order from an object side toward an image side, a first lens unit configured to be fixed when performing a magnification variation, a second lens unit configured to perform a magnification variation by moving in an optical axis direction, a third lens unit configured to be fixed when performing a magnification variation, a fourth lens unit configured to perform a focus control by moving in the optical axis direction; a controller configured to control an actuator, and to thereby move the second lens unit; and a temperature detector configured to detect a temperature of the optical apparatus, wherein the controller, without changing a telephoto end position of the fourth lens unit even when the temperature detected by the temperature detector changes, sets a telephoto end position of the second lens unit to a first position when the temperature detected by the temperature detector is a first temperature, and the controller sets the telephoto end position of the second lens unit to a second position closer to a wide-angle side than the first position when the temperature detected by the temperature detector is a second temperature higher than the first temperature.