Internal Extender Switch When the lens or camera is in operation (during Auto Focus, Image Stabilization*, exposure, continuous shooting, use of the focus preset, power focus operation, etc.). ... Not doing so may result in an error message being displayed (ERR01) and prevent shooting operation. Turn the camera OFF and then ON to clear the error message . ... However, the aperture value displayed will not change when the lens is not in operation or when the lens shuts down in order to save power .
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