Remote control for flash device

A remote control for controlling at least one group of flash devices for photography, the remote controller comprising:

• a display,
• wherein the remote control is configured:
• to send, after receiving a trigger signal TC from a camera, a wireless pre-flash trigger signal, TPF, to the flash devices for initiating a pre-flash (PF) from the flash devices, wherein each flash device has a preset pre-flash strength, EPF, and the sum of all pre-flash strengths, EPF, corresponds to a total pre-flash strength ETPF, and
• to receive from the camera, after sending the pre-flash trigger signal, TPF, a flash adjustment value, VA, corresponding to the exponent in the relationship
• EDMF=ETPF·XVA,
• wherein EDMF is a desired sum of main flash strengths from the flash devices, and X is a predetermined factor,
• to determine a main flash strength value, VMF, based on a pre-flash strength value, VPF, stored in the remote control, the flash adjustment value VA, and a predetermined relationship between the pre-flash strength value, VPF, the flash adjustment value, VA, and the main flash strength value, VMF,
• to display the main flash strength value, VMF, on the display,
• to send a wireless control signal, SC, to each flash device for adjustment of the flash strength from each flash device at least according to the flash adjustment value, VA, and
• to send a wireless main flash trigger signal, TMF, to the flash devices, for initiating a main flash, MF, with the adjusted flash strength, from each flash device.