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For sophisticated wireless flash setups, there's nothing like the new Speedlite Transmitter ST-E3-RT. Facilitating radio controlled, two-way wireless transmission up to 98.4 feet, among up to five groups or fifteen individual Speedlites, the ST-E3-RT represents the next generation in wireless flash systems. With operational controls similar to the new Speedlite 600EX-RT, including diverse flash metering options, and a number of flash modes, the Speedlite Transmitter ST-E3-RT makes complex lighting setups simple. With a compact design and highly reliable construction, combined with a clearly laid-out information panel and buttons with back lighting and more, the Speedlite Transmitter ST-E3-RT is an indispensible tool for advanced, professional flash photography.
*Because it does not have an optical transmission function, the Speedlite Transmitter ST-E3-RT is not compatible with earlier Speedlite models such as 580EX II.
Type - Radio transmissions wireless Speedlite transmitterCompatible Cameras - Type A EOS cameras (E-TTL II/E-TTL autoflash)Sync Speed - High-Speed Sync provided (EOS-1D X and EOS 5D Mark III only)Flash Exposure Confirmation - Flash exposure confirmation lamp lights in greenAF Assist Beam - N/AWireless Functions - Transmission System - Radio TransmissionTransmission Range - Approx. 98.4 ft. (30m)Flash Ratio Control - 1:8 - 1:1 - 8:1, power 1/2-stop incrementsFlash Coverage - Transmission Angle: 360? all aroundSlave Operation Confirmation - Green LightLit: Radio Transmissions Okay
Red LightLit: Not ConnectedBlinking: Transmission Error/ Too many units (Master units + slave units = more than 16 units)
Orange LightLit: Sub-master transmissionBlinking: Receiving remote release shooting, linked shooting signalSlave Unit SE Mode Cancellation - The test flash button can be pressed to test if the slave 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 used (At a room temperature +23?C/73?F).SE Mode - Power off after 5 min. of idle operationDimensions - 2.65 (W) x 2.42 (H) x 3.05 (D) in. / 67.4 (W) x 61.5 (H) x 77.4 (D) mmWeight - 3.9 oz. / 110g (excluding battery)