Canon Speedlite Transmitter STE

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In addition, Canon offers the Speedlite Transmitter ST-E2, a small flash control unit that fits on the camera's hot shoe. The ST-E2 offers wireless control of multiple master and slave Speedlites, and it's a handy way to control multiple flash setups.

Some features of the ST-E2 include:

► Control up to three groups of Speedlites, with the ability to control the slave units' IDs.

► Modeling flash. This fires at the flash ratio that you've set and is triggered by pressing the Depth of Field Preview button on the camera.

► An AF assist beam compatible with 28mm-and-longer lens focal lengths. The AF assist beam has an effective range of approximately 2.0 to 16.5 feet along the periphery (in total darkness).

► Flash ratio control as well as adjustment and channel control. The flash ratio control for the A:B ratio is 1:8 to 8:1, in half-step increments, or 13 steps.

► FE Lock, Flash Exposure Bracketing, Flash Exposure Compensation, stroboscopic flash, and high-speed sync (FP flash) in HighSpeed Sync mode for flash synchronization at all shutter speeds. Flash Exposure Compensation during FE Lock is indicated when the flash exposure level icon is lit in the viewfinder. If the flash exposure is insufficient, the icon blinks. After the flash fires, the ST-E2 flash confirmation lamp lights in green for 3 seconds.

Image courtesy of Canon

7.8 The Canon Speedlite Transmitter ST-E2

Image courtesy of Canon

7.8 The Canon Speedlite Transmitter ST-E2

► Infrared pulse transmission system with a range of approximately 39.4 to 49.2 feet indoors and approximately 26.2 to 32.8

feet outdoors. The flash transmission coverage is +/-40° horizontal and +/-30° vertical.

For multiple off-camera Speedlite shooting, the ST-E2 is invaluable because it gives you cable-less operation and precise flash ratio control. The unit is powered by CR5 lithium batteries. I prefer to use rechargeable CR5s for the ST-E2, which provide approximately 1,000 to 1,500 transmissions per charge.

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