Quick Summary
The Canon ST E2 Flash Speedlite Wireless Remote Transmitter is an on camera master unit for photographers who want wireless optical control of compatible Canon Speedlites without using a master flash on the hot shoe. It supports Canon E TTL flash metering and ratio control between two groups of slave flashes, making it a practical choice for portraits, studio style setups and controlled indoor lighting.
Who It Is Best For
This is a good fit for photographers who want a cleaner camera setup while controlling off camera flash. It suits people working in indoor or shaded environments where line of sight can be maintained, and anyone who prefers a straightforward way to balance key and fill light with Canon’s native E TTL system.
What To Know Before You Buy
The ST E2 uses optical transmission, so it works best where the transmitter can see the slave flashes. It controls two flash groups and is described as compatible with Canon Speedlites except 220EX.
Pros: Enables wireless E TTL control without a master flash, with ratio control for two groups and a compact, lightweight design.
Cons: Optical control needs line of sight and is less reliable in bright sunlight.
Common Buyer Questions
Does the Canon ST E2 trigger flashes wirelessly?
Yes, it sends optical control signals to compatible Canon Speedlites.
Can it control more than one flash group?
Yes, it supports ratio control between two groups of slave flashes.
Is it suitable for outdoor use?
It can be used outside, but it works best indoors or in shaded conditions where line of sight is easier to keep.
Does it emit flash light itself?
No, it only transmits control signals.
Is it compatible with all Canon Speedlites?
It is listed as compatible with Canon Speedlites except the 220EX.
Key Details
| Detail | What it means in use |
|---|---|
| Device type | Optical wireless flash transmitter |
| Flash control system | Canon E TTL |
| Flash groups | Two controllable groups |
| Exposure ratio range | Six stop range |
| Compatibility | Canon Speedlites except 220EX |
| Use mode | On camera master unit |
| Product colour | Black |
Final Buying View
The Canon ST E2 is a straightforward choice if you want wireless Canon flash control in a compact on camera unit. It is especially useful for indoor portraits, studio style lighting and other controlled setups where optical line of sight is not a problem. If that matches the way you shoot, it offers a simple way to manage flash groups without adding bulk to the camera.
