Canon has introduced a new version of the Speedlite ST E3 RT transmitter for wireless control of Speedlites. Designated the Speedlite ST E3 RT (Ver. 2), this new addition supports the core functionality of the Speedlite EL-1 introduced last fall and expands the shooting capabilities of the previously released RT Series Speedlites (600EX II-RT, 600EX-RT and 430EX III-RT).
New to the ST E3 RT (Ver.2) include second-curtain sync, support for Speedlite EL-1 at ultra-low power 1/8192 and the ability to memorize flash exposure. The transmitter works by radio.
Second-curtain sync helps you get more natural shots of moving subjects. The 1/8192 pulse, according to the manufacturer, “delicately emphasizes the necessary details without disturbing the frame’s atmosphere and natural light.” With regard to flash exposure memory, this function makes manual flash operation more convenient. By saving the flash settings, the photographer can immediately start shooting in E-TTL mode. It can enter manual mode if necessary to adjust settings, but the original E-TTL settings are retained.
One transmitter can control 15 flashes in 5 groups at a distance of up to 30 m. It is protected from dust and moisture. Two AA batteries are used as a power source. The dimensions of the transmitter are 67.4 x 61.5 x 77.4 mm, weight – 110 g.
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