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Canon
Speedlite Transmitter ST-E3-RT (Ver.2)
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The Speedlite Transmitter ST-E3-RT (Ver.2) provides some much anticipated upgrades from professionals to make it an even more appealing resource for flash photography when used with the Speedlite EL-1. This updated version allows for wireless rear curtain synchronization to capture ambient light trails and convey a sense of speed for moving subjects. The expansive minimum output range (down to 1/8192 power) gives you increased opportunity for creativity over the flash output from brightest to dimmest. And you now have FE Memory as part of the radio transmitter, so you can lock-in an E-TTL flash exposure level, even in complex multi-flash set-ups, and continue to use it for the same scene or subject. These improvements combine with the previous benefits of its predecessor including radio controlled, two-way wireless transmission up to 98.4 ft., among up to five groups or fifteen individual Speedlites, a dot matrix LCD with backlighting, intuitive controls and more.
Disclaimer
- Manual flash power below 1/128th not possible with 600EX-RT series, and 430EX-RT used as receiver units
- 2nd curtain sync can be used with Speedlite EL-1, 600EX-RT series and 430EX-RT receiver units, but with EOS R5, R6, or EOS-1D X Mark III cameras only
Disclaimer
- Manual flash power below 1/128th not possible with 600EX-RT series, and 430EX-RT used as receiver units
- 2nd curtain sync can be used with Speedlite EL-1, 600EX-RT series and 430EX-RT receiver units, but with EOS R5, R6, or EOS-1D X Mark III cameras only
Main Unit Spec
Flash | |
Type | Radio transmissions wireless Speedlite transmitter |
Compatible Cameras | Type A EOS cameras (E-TTL II/E-TTL autoflash) |
Sync Speed | High-Speed Sync provided |
Flash Exposure Confirmation | Flash exposure confirmation lamp lights in green* * If it does not light, shooting is not performed with the standard exposure |
Wireless Functions | |
Transmission System | Radio Transmission |
Transmission Range | Approx. 98.4 ft. (30m) |
Flash Ratio Control | 1:8 - 1:1 - 8:1, power 1/2-stop increments |
Flash Coverage | Transmission Angle: 360° all around |
Flash Exposure Compensation | Flash exposure confirmation lamp lights in green* * If it does not light, shooting is not performed with the standard exposure |
Slave Operation Confirmation | Green Light Lit: Radio Transmissions Okay Red Light Lit: Not Connected Blinking: Transmission Error/ Too many units (Sender units + sender units = more than 16 units) Orange Light Lit: Sub-sender transmission Blinking: Receiving remote release shooting, linked shooting signal |
Slave Unit SE Mode Cancellation | The test flash button can be pressed to test if the receiver units fire or cancel the auto power off status. |
General | |
Power Source | AA/LRG Alkaline Batteries x2(Ni-MH and Lithium batteries can also be
used) Battery Life: Approx. 10 hours continuously when using AA/LR6 alkaline batteries (At a room temperature 23°C/73°F). |
SE Mode | Power off after 5 min. of idle operation |
Dimensions | 2.7 (W) x 2.4 (H) x 3.0 (D) in. / 67.4 (W) x 61.5 (H) x 77.4 (D) mm |
Weight | 3.9 oz. / 110g (excluding battery) | FE Memory - Yes Second-curtain Sync Yes*2 *2Cameras that support wireless second-curtain sync as of February 2021:
|
Disclaimer
- Manual flash power below 1/128th not possible with 600EX-RT series, and 430EX-RT used as receiver units
- 2nd curtain sync can be used with Speedlite EL-1, 600EX-RT series and 430EX-RT receiver units, but with EOS R5, R6, or EOS-1D X Mark III cameras only
Disclaimer
- Manual flash power below 1/128th not possible with 600EX-RT series, and 430EX-RT used as receiver units
- 2nd curtain sync can be used with Speedlite EL-1, 600EX-RT series and 430EX-RT receiver units, but with EOS R5, R6, or EOS-1D X Mark III cameras only
Speedlite Transmitter ST-E3-RT (Ver.2)![]() |
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Disclaimer
- Manual flash power below 1/128th not possible with 600EX-RT series, and 430EX-RT used as receiver units
- 2nd curtain sync can be used with Speedlite EL-1, 600EX-RT series and 430EX-RT receiver units, but with EOS R5, R6, or EOS-1D X Mark III cameras only