Meike Mk-320 Mk320-n HSS Master Control TTL Flash Speedlite for Nikon J1 J2 J3 D750 D610 D7100 D5100 D5200 D3300 Ect TTL function: TTL full-automatica flash is to automatically adjust the flash intensity of the flash lamp for the correct flashing according to the feedback signal from the photometry of the camera lens High precsion manual adjustment: 8 Power levels, each level has 3 fine tuning adjustment, providing you a more precise brightnessoutput and flexible brightness control Strobpscopic flash function: The strobosopic flash is to record the continuous motion of the subject in a picture in virtue of the continuous flash of the electronic flasher High-speed Master Control: In this mode,the remote control lights(The flash light is set to the REMOTE mode) are divided into three groups. Then set the MK320 camera to the master control light mode and subsequently set the flash mode and the compensation value of the flash output for each group,respectively. Choose one of the four channels available to allow the data exchange between the master control flash light and the remote control flasher lights via the selected channel.[Remarks:This function is only for the case that the remote control flash lights support the high-speed synchronous function.] S1/S1 mode S1 mode: It is suitable for the manual mode and when the master control flashlight is on, the remote control flashlights will be triggered; S2 mode:It is suitable for the master TTL mode, and only when the second flash of the master control flashlight is present can the remote control flashlights be triggered