Canon ST-E3-RT SPEEDLITE Transmitter Version 3

FLASHType    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    YesExposure 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 aroundSecond-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 signalReceiver 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 PanelLCD 172 x 104 dot displayGeneral

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)