An interchangeable lens is removably attached to a camera body including a body-side mount, an image sensor, body-side terminals and a first to fourth body-side claws. The interchangeable lens includes the lens-side mount, lens-side terminals which are in contact with body-side terminals, a first to fourth lens-side claws engaged with the first to fourth body-side claws once the interchangeable lens is attached to the camera body. The first and third lens-side claws are disposed on a third lens-side line intersecting with the first lens-side line at an optical axis with approximately 45 degrees. The first lens-side line passes through a center between opposite ends of the first lens-side claw to the optical axis. The second and fourth lens-side claws are disposed on a fourth lens-side line orthogonal to the third lens-side line at the optical axis.

A fixed focal length imaging optical system includes a first lens group having positive power, a second lens group having positive power, and a third lens group having negative power in order from an object side toward an image side. Upon focusing, the second lens group moves along an optical axis, and the first lens group and the third lens group do not move. The present disclosure provides the fixed focal length imaging optical system capable of favorably correcting various aberrations such as spherical aberration, astigmatism, and distortion, and an imaging device and a camera system each of which includes the fixed focal length imaging optical system.

A fixed focal length imaging optical system includes a first lens group having positive power, a second lens group having positive power, and a third lens group having negative power in order from an object side toward an image side. Upon focusing, the second lens group moves along an optical axis, and the first lens group and the third lens group do not move. The present disclosure provides the fixed focal length imaging optical system capable of favorably correcting various aberrations such as spherical aberration, astigmatism, and distortion, and an imaging device and a camera system each of which includes the fixed focal length imaging optical system.

An imaging apparatus includes an interchangeable lens, and a camera body. The interchangeable lens includes a correction lens, a lens driver, and a first controller. The camera body includes an image sensor, a sensor driver, and a second controller. The first or second controller selects one of the interchangeable lens and the camera body, in accordance with a level of correction capability to perform the image stabilization. Corresponding to the selected one, one driver of the lens driver and the sensor driver performs the image stabilization for the image blur within a predetermined range. The other driver corresponding to non-selected one performs the image stabilization for a remaining portion of the image blur exceeding the predetermined range.

An imaging apparatus includes an interchangeable lens, and a camera body. The interchangeable lens includes a correction lens, a lens driver, and a first controller. The camera body includes an image sensor, a sensor driver, and a second controller. The first or second controller selects one of the interchangeable lens and the camera body, in accordance with a level of correction capability to perform the image stabilization. Corresponding to the selected one, one driver of the lens driver and the sensor driver performs the image stabilization for the image blur within a predetermined range. The other driver corresponding to non-selected one performs the image stabilization for a remaining portion of the image blur exceeding the predetermined range.

A lens apparatus includes an aperture stop, a driving device configured to drive the aperture stop, a storage storing a driving instruction value for driving the aperture stop, and a controller configured to perform control of the driving device based on the driving instruction value. The storage stores the driving instruction value, among a plurality of ones of the driving instruction value, by which an absolute value of a difference, between a target aperture value and an actual aperture value obtained by the control, that is largest with respect to a plurality of ones of the drive amount is minimized.

A lens apparatus includes an aperture stop, a driving device configured to drive the aperture stop, a storage storing a driving instruction value for driving the aperture stop, and a controller configured to perform control of the driving device based on the driving instruction value. The storage stores the driving instruction value, among a plurality of ones of the driving instruction value, by which an absolute value of a difference, between a target aperture value and an actual aperture value obtained by the control, that is largest with respect to a plurality of ones of the drive amount is minimized.

A lens apparatus attachable to an imaging apparatus via an accessory, the lens apparatus includes an acquirer configured to acquire first power information indicating power available for the accessory, a determiner configured to determine second power information indicating power available for the lens apparatus based on the first power information, and a transmitter configured to transmit, to the imaging apparatus, the second power information or power information relating to the first power information and the second power information.

A lens apparatus attachable to an imaging apparatus via an accessory, the lens apparatus includes an acquirer configured to acquire first power information indicating power available for the accessory, a determiner configured to determine second power information indicating power available for the lens apparatus based on the first power information, and a transmitter configured to transmit, to the imaging apparatus, the second power information or power information relating to the first power information and the second power information.

An image pickup apparatus includes an image sensor, a lens, and an electric module disposed outside the lens when viewed in a first direction. The electric module includes a first inductor, a first transformer, a second inductor, and a second transformer. A second terminal of the first inductor is connected to a third terminal of the first primary winding. A fifth terminal of the second inductor is connected to a seventh terminal of the second primary winding. The first inductor is wound clockwise from a first terminal toward the second terminal. The second inductor is wound counterclockwise from a sixth terminal toward the fifth terminal. The first primary winding is wound counterclockwise from the third terminal toward a fourth terminal. The second primary winding is wound clockwise from the seventh terminal toward the eighth terminal.