What is the meaning and effect of wireless flash with built-in flash?

External flash (hereinafter referred to as external flash), set-top box flash (hereinafter referred to as internal flash)

1, the flash can be triggered by illumination, radio signals and infrared signals.

2. Manual multi-lamp photography is to manually set the brightness of each flash. When shooting, the camera sends out a synchronous flash signal, which triggers all the flashes to work together. The trigger signal may be a PC synchronization line, strong light from an internal flash, a radio transmitter connected to a hot shoe, and a radio receiver connected to an external flash. These methods can only control when the flash is on, and adjusting the brightness of each lamp can only make the photographer run back and forth, which is time-consuming and laborious.

3. The internal flash is used to send short and continuous pulsed strong light, and the brightness signal carried by it is sent to all external flash. After receiving and decoding, each lamp determines the luminous intensity during this shooting. This makes it easier for the photographer to set the brightness of each lamp on the camera.

4. In Canon system, only 580 external flash, ST-E2 controller, 7D internal flash, 60D internal flash and 600D internal flash can send commands to remotely control subordinate external flash.

5. In Nikon system, flash instruction has been supported since D200 and D90.

6. The difference is that Canon adopts TTL photometry, which realizes the direct setting of the brightness ratio of A:B group lamps, which is beneficial to beginners. Nikon can set each group to TTL or manual, but it is more troublesome for Nikon to adjust the light ratio of TTL.

7. The most direct effect is that you don't have to spend hundreds of dollars to buy a director.