Canon Flash Accessories | ST-E3-RT SPEEDLITE Transmitter Version 3

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
FE Memory Yes

Exposure Contol
E-TTL II / E-TTL autoflash Yes
Manual  1/1 – 1/8192*¹
  ( First curtain only when the second curtain is set.)
  Less than 1/128 power possible only with Speedlite EL-1, used as receiver unit(s),

Multiple 1/4-1/8192*¹
1-500Hz
  Less than 1/128 power possible only with Speedlite EL-1, used as receiver unit(s)

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

Second-curtain Sync Yes*²
*² Cameras that support wireless second-curtain sync as of February 2021:
• EOS-1D X Mark III*³
• EOS R5*³
• EOS R6*³
• EOS M50 Mark II
 *³: Camera body must have firmware installed that supports Speedlite EL-1.

Receiver Operation Confirmation  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

Receiver 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.

LCD Panel

LCD 172 x 104 dot display

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 73°F/23°C).
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)

Speedlite Transmitter ST-E3-RT (Ver. 3)
• Soft Case