Speedlite Transmitter ST-E3-RT (Ver. 2)
Specications
Flash
Typ e Radio transmissions wireless Speedlite transmitter
Compatible Cameras Type A EOS cameras (E-TTL II/E-TTL autoash)
Sync Speed High-Speed Sync provided
Flash Exposure Conrmation
FE Memor y Yes
Flash exposure conrmation lamp lights in green*
* If it does not light, shooting is not performed with the standard exposure
Exposure Contol
E-TTL II / E-TTL autoash Yes
1/1 - 1/8192*¹
Manual
Multiple
( First curtain only when the second curtain is set.)
*¹ Less than 1/128 power possible only with Speedlite EL-1, used as receiver unit(s), as of
Februar y, 2021.
1/4-1/8192*¹
1-500Hz
*¹ Less than 1/128 power possible only with Speedlite EL-1, used as receiver unit(s), as of
Februar y, 2021.
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
Yes*²
*² Cameras that support wireless second-curtain sync as of February 2021:
• EOS-1D X Mark III*³
Second-curtain Sync
• EOS R5*³
• EOS R6*³
• EOS M50 Mark II
*³: Camera body must have rmware installed that supports Speedlite EL-1.
Receiver Operation Conrmation
Receiver Unit SE Mode Cancellation
Green Light
Lit: Radio Transmissions Okay
Red Light
Lit: Not Connected
Blinking: Transmission Error/ Too many units (Sender units + receiver units =
more than 15 units)
Orange Light
Lit: Sub-sender transmission
Blinking: Receiving remote release shooting, linked shooting signal
The test ash button can be pressed to test if the receiver units re or cancel the
auto power o status.
LCD Panel
LCD 172 x 104 dot display
General
AA /LRG Alkaline Batteries x2(Ni-MH and Lithium batteries can also be used)
Power Source
SE Mode Power o 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)
Battery Life: Approx. 10 hours continuously *When using AA/LR6 alkaline
batteries (At a room temperature 73°F/23°C).