E-TTLⅡ technology
High-speed sync
Wireless multiple flash
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Flash Terminology
Wireless multiple flash
Multiple flash photography can bring out every detail.
image:Multiple flash (3 units)
Multiple flash (3 units)     EF35mm f/1.4 USM, 1/60, f/2.8
Sample photo analysis
image:Direct lighting (single flash unit)
Direct lighting (single flash unit)
Flash PlacementThree flash units provided illumination. The light from the master flash unit, a Speedlite 580EX mounted on the camera, was bounced off the wall to soften its intensity before reaching the two violinmakers. A slave 580EX was set far enough away on a desk to be pointed directly at the statue, and another 580EX was used to light up the overall office. Based on the results displayed on the camera's LCD monitor, the brightness of the master flash unit was halved to achieve a natural result.
Wireless multiple flash units illuminate the subject and background.
In rooms lacking ambient light, the use of a single flash unit that directly lights the subject may result in a brightly lit subject and extremely dark background. To effectively illuminate both the subject and background with the desired amount of light, from the desired directions, a photographer may choose to employ multiple flash units.

The use of multiple flash units can complicate the setting of exposure. But with EX Series Speedlites, photographers simply press the shutter button as with single-flash photography since the flash units automatically set their own exposure. For even more convenience, slave Speedlite 580EX and 430EX flash units can be wirelessly controlled from a Speedlite 580EX or Speedlite Transmitter ST-E2 mounted on an EOS camera.

In multiple-flash photography, the master flash unit is generally set up before the slave units. Achieving the right balance of exposure settings usually requires a combination of experience and guesswork. But EOS and EOS DIGITAL cameras combined with EX Series Speedlites greatly simplify the process and heighten the enjoyment. Furthermore, results can be checked on the LCD monitor of EOS DIGITAL cameras, allowing adjustment on the spot.

Note: Macro Ring Lite MR-14EX and Macro Twin Lite MT-24EX can also serve as master flash units.
Up to three groups of flash units can be used to realize your creative vision.
Simultaneous control of up to three groups of Speedlites (A, B and C) is possible. The photographer simply chooses a lighting ratio between the A and B groups, with ratios as high as 8:1 or as low as 1:8, and lets the units automatically adjust their own exposure level to maintain the lighting ratio. There is no cumbersome manual adjustment of exposure. The brightness of group C is then controlled independently of the other two groups, allowing effective illumination of the background or accentuation of key areas. Overall lighting is easily adjusted while monitoring the results on the camera's LCD monitor. Using the master flash unit, the photographer simply adjusts the lighting ratio between the A and B groups and the light level of the C group to attain desired lighting.

Note: The lighting ratio between the A and B groups can also be adjusted via Speedlite transmitter ST-E2.
Wireless multiple-flash photography tip
・ Avoid having obstacles between the camera and slave flash units.
Whether using a master flash unit or Speedlite Transmitter, your commands to slave flash units are transmitted by light pulses or infrared signals that are easily blocked by thick walls, large furniture and other dense objects. When deciding camera and flash locations, it is wise to take this factor into account.
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