Exchangeable lens and camera body

An exchangeable lens, comprising:na mount unit at which a camera body is detachably engaged;a plurality of drive target members, conditions of which change as a drive force is applied thereto;an initialization unit that executes initialization processing for each of the plurality of drive target members;a first transmission unit that transmits initialization statuses, each indicating a status of the initialization processing executed for one of the drive target members, to the camera body via a first transmission path over predetermined first cycles; anda second transmission unit that transmits a position information of at least one drive target member among the plurality of drive target members to the camera body via a second transmission path different from the first transmission path over predetermined second cycles different from the predetermined first cycles, whereinuntil the initialization unit completes initialization processing for all of the plurality of drive target members, the first transmission unit continues transmitting a first information over predetermined cycles, the first information indicating that all of the initialization processing for the plurality of drive target members has not been completed.