The Canon Speedlite Transmitter ST-E2 is a wireless infra-red transmitter that can be used to trigger up to two Speedlite flash slave groups with different power outputs. The ST-E2 transmitter can also be used for focus assisting in low light situations.
Using one or two Speedlites that are not directly located overtop of the camera lens can significantly enhance the light on your subject.
The Hold button on the back control pane of the ST-E2 is a very useful feature to prevent an accidental change in your settings. The transmitter has four different channels, which is more than enough for any situation you may encounter.
The ST-E2 is very light compared to some of the other Canon accessories. It weighs less than 1/4 of a pound (only 100g without the battery).
You can control the lighting ratio between the different speedlites up to an 8:1 ratio and also down to 1:8 ratio.
Rather than have your Speedlite flash unit mounted to the camera's hot shoe on top, connect the ST-E2 in its place on the hot shoe. Then, you'll set up your Speedlite(s) as slaves on their back control panels.
Your Speedlite flash units can now be place off the lens axis to give you better, more pleasing, flash illumination.
You'll find the following video on how to use the Canon ST-E2 transmitter very helpful. It's less than 3 minutes long, so watch it right now.
One of its more under-used benefits is that the ST-E2 can be used as a stand-alone focus assist in situations where your Canon camera is struggling to focus on it's own.
This is a great feature when you are shooting in low-light situations.
It has an outside shooting range rated at about 30 feet and indoor about 45 feet.
With indoor shooting you have the added advantage of the infrared pulses bouncing off walls to give you more flexibility in placement of your speedlite. Otherwise your speedlite must be in direct line-of-sight view from your transmitter.
Some ST-E2 units ship with the 2CR5 battery and some don't, so pay attention when you do your shopping.
If the ST-E2 sits idle for 90 seconds, the Save Energy kicks in and turns off the power to prolong battery life. A gentle touch to the camera shutter button wakes it up instantly.
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The St-E2 transmitter comes with an owner's manual. I recommend you check out the manual. Reading it will give you a much better understanding of how you can take advantage of its features.
I got a real kick out of the illustration on page 26 of the ST-E2 manual. It's a good illustration on how to use the Canon ST-E2 but the subject's pose might be difficult to achieve.
Here is the link to the Canon Speedlite ST-E2 Manual PDF
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