Patent ID: 8755127

Claim:
An optical apparatus comprising a controller configured to control driving of a focus lens by a driver in accordance with an operation of an operating unit in manual focusing: wherein a moving speed of the focus lens is expressed by a function of an operating speed of the operating unit, and the controller generates a control signal for the driver in accordance with the function, wherein when the operating speed of the operating unit is equal to or lower than a threshold, the function is such a linear function that the moving speed of the focus lens linearly increases as the operating speed of the operating unit increases, wherein when the operating speed of the operating unit is higher than the threshold, a differential value of the function increases as the operating speed of the operating unit increases, and wherein the function is continuous at the threshold, and the differential value of the function at the threshold used when the operating speed of the operating unit is equal to or lower than the threshold is equal to the differential value of the function at the threshold used when the operating speed of the operating unit is higher than the threshold.