Abstract: A video camera apparatus includes a lens for forming an image, a camera circuit for converting the image formed by the lens into an image signal and outputting the image signal, and a controlling circuit for performing an initialization operation in which, before photography is started, information indicative of the state of the optical system is obtained and the lens is initialized, and for controlling an output signal of the camera circuit to fade the output signal in association with the initialization operation.

Abstract: A video camera apparatus includes a lens for forming an image, a camera circuit for converting the image formed by the lens into an image signal and outputting the image signal, and a controlling circuit for performing an initialization operation in which, before photography is started, information indicative of the state of the optical system is obtained and the lens is initialized, and for controlling an output signal of the camera circuit to fade the output signal in association with the initialization operation.

Abstract: A sound processing device for processing sound is arranged to control an attenuation characteristic for attenuating the low-frequency signal of an input audio signal according to the level thereof, whereby it is possible to suppress a noise component contained in sound without substantial impairment in auditory sound quality.

Abstract: An interchangeable lens unit for use in a camera system which is arranged to drive a motor in the interchangeable lens on the basis of a signal supplied from a camera body. The interchangeable lens unit is provided with a circuit for continuously transmitting a specific signal to the camera body for at least the time period required to absorb a backlash when the direction of running of the motor is reversed with respect to the preceding direction of running of the same.

Abstract: Disclosed is an interchangeable lens system which comprises an interchangeable lens and a camera. the interchangeable lens includes a driving circuit controlled by data transmitted from the camera to the lens such that it displaces a controlled member of the lens, a detection circuit for detecting a displacement of the driving circuit, and a correction circuit for converting the output characteristics of the detection circuit into predetermined common characteristics. The camera includes a control circuit for driving the driving circuit in the interchangeable lens in response to the output of the detection circuit in the interchangeable lens.

Abstract: An image stabilization apparatus of an inertial pendulum type corrects vibration of an image by a correcting optical device relatively displaceable with respect to a barrel. The apparatus includes a restriction device for generating an operational effect which changes according to a position of the correcting optical device for restricting the relative displacement of the correcting optical device, and a controller for changing the effect of the restriction device in accordance with a focal length or a direction of displacement of the correcting optical device.

Abstract: An image-stabilized optical device comprising, from front to rear, a first lens group of negative power, a second lens group of positive power and a rear lens group of positive power for forming an image, wherein the second lens group rotates around a point which is on the optical axis away from its rear principal point rearward by a distance of about .beta.2.multidot.f1/(1-.beta.2) where .beta.2 is the image magnification of the second lens group and f1 is the focal length of the first lens group, and lies within the rear lens group, whereby the image is stabilized against accidental vibrations.

Abstract: Disclosed is an interchangeable lens system which comprises an interchangeable lens and a camera. The interchangeable lens includes a driving circuit controlled by data transmitted from the camera to the lens such that it displaces a controlled member of the lens, a detection circuit for detecting a displacement of the driving circuit, and a correction circuit for converting the output characteristics of the detection circuit into predetermined common characteristics. The camera includes a control circuit for driving the driving circuit in the interchangeable lens in response to the output of the detection circuit in the interchangeable lens.