Exchangeable lens and camera body

An exchangeable lens, comprising:

• a 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;
• and
• a 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, wherein
• until 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.