Imaging apparatus, light emitting apparatus, and camera system

A light emitting apparatus capable of communicating with another light emitting apparatus using a radio wave, comprising:

• a detection unit configured to detect a light emission start instruction issued from an imaging apparatus to another light emitting apparatus;
• a radio wave communication unit configured to transmit data indicating the light emission start instruction based on the light emission start instruction detected by the detection unit to another light emitting apparatus;
• an acquisition unit configured to acquire a first light emission delay time that another light emitting apparatus requires for the processing from completion of reception of the data indicating the light emission start instruction issued from the radio wave communication unit, to start of light emission;
• and
• an output unit configured to output, to the imaging apparatus, the first light emission delay time acquired by the acquisition unit, and a second light emission delay time required for the processing from detection of the light emission start instruction by the detection unit to completion of transmission of the data indicating the light emission start instruction issued from the radio wave communication unit.

A camera system including an imaging apparatus and a light emitting apparatus capable of communicating with each other via a radio wave communication unit using a radio wave, the camera system comprising:

• a light emission start instruction unit configured to output a light emission start instruction addressed to the light emitting apparatus, to the radio wave communication unit;
• an acquisition unit configured to acquire a first light emission delay time that the light emitting apparatus requires for the processing from completion of reception of data indicating the light emission start instruction issued from the radio wave communication unit to start of light emission;
• and
• a control unit configured to control timing at which the imaging apparatus starts an operation corresponding to the light emission performed according to the light emission start instruction based on the first light emission delay time acquired by the acquisition unit, and a second light emission delay time required for the processing from an output of the light emission start instruction issued from the light emission start instruction unit, to completion of transmission of the data indicating the light emission start instruction issued from the radio wave communication unit.