Method, transmission unit, system and computer program for wireless communication between a camera and at least one remote flash device

A method performed in an intermediate radio transmission unit for adjusting a power relation between a plurality of different remote flash devices using through-the-lens (TTL) flash control, the method comprising the steps of:

• transmitting information to the respective remote flash devices corresponding to different amounts of power for their respective preflashes;
• receiving from a camera a preflash activation signal;
• transmitting the preflash activation signal to the respective remote flash devices preflashes for emission with a power relation according to the information transmitted to the respective remote flash devices, wherein the power relation is adjusted between the plurality of different remote flash devices at least in part using through-the-lens (TTL) flash control;
• transmitting one common amplification to be applied during subsequent main flashes to all of the different remote flash devices, said one common amplification being received from the camera;
• and
• transmitting to the remote flash devices a main flash activation signal received from the camera.

A method for through-the-lens, TTL, control of a plurality of different remote flash devices, said method comprising the steps of:

• receiving by the different remote flash devices respective inputs indicating amounts of power that the different remote flash devices should use for preflashes, wherein the plurality of different remote flash devices are controlled at least in part via through-the-lens, TTL, control;
• emitting at the same point in time from the different remote flash devices preflashes with different powers according to the received respective inputs;
• and
• receiving by the different remote flash devices one common amplification relating to the amount of light energy required from the different remote flash devices for exposure of an image acquisition in present preflash lighting conditions based on the preflashes emitted with the amounts of power as indicated by the respective inputs.

A method performed in an intermediate radio transmission unit for through-the-lens, TTL, control of a plurality of different remote flash devices, said method comprising the steps of:

• transmitting to the different remote flash devices respective inputs indicating amounts of power that the different remote flash devices should use for the preflashes, wherein the plurality of different remote flash devices are controlled at least in part via through-the-lens, TTL, control;
• transmitting to the remote flash devices an activation signal for emitting at the same point in time from the different remote flash devices preflashes with different powers according to the respective inputs;
• and
• transmitting to the different remote flash devices one common amplification relating to the amount of light energy required from the different remote flash devices for exposure of an image acquisition in present preflash lighting conditions based on the preflashes emitted with the amounts of power as indicated by the respective inputs.