Canon Speedlite Transmitter ST-E3-RT Instruction Manual - Page 66

Specifications Type Type: Compatible cameras: On-camera Speedlite transmitter EOS type-A camera compatible with E-TTL II/E-TTL autoflash Radio Transmission Wireless Function Exposure control system: E-TTL II/E-TTL autoflash, manual flash, stroboscopic flash, auto external flash metering* * Only when the flash mode is set to Frequency: 2405 - 2475 MHz Modulation system: Primary modulation: OQPSK, secondary modulation: DS-SS Channel: Auto, Ch. 1 - 15 Wireless radio ID: 0000 - 9999 Slave unit control: Up to 5 groups (A/B/C/D/E), up to 15 units Transmission distance: Approx. 30 m / 98.4 ft. * When there are no obstacles or obstructions between the master unit and slave unit, and no radio interference with other devices * The transmission distance may be shorter depending on the relative positions of the units, surrounding environment and weather conditions. Flash ratio control: 1:8 - 1:1 - 8:1, 1/2-stop increments Flash exposure compensation: ±3 stops in 1/3- or 1/2-stop increments FEB: FE lock: ±3 stops in 1/3- or 1/2-stop increments (when used with flash exposure compensation) Press the camera's , or button High-speed sync: Provided * High-speed sync is possible only with EOS digital cameras released since 2012. Manual flash: 1/1 - 1/128 power (1/3-stop increments) Stroboscopic flash: Provided (1 - 500 Hz) Slave flash battery check: On the master unit's LCD panel, the icon lights, the slave unit's AF-assist beam emitter blinks and the charge lamp lights. Flash exposure confirmation: Flash exposure confirmation lamp lights Modeling flash: Fired with camera's depth-of-field preview button Linked shooting: Provided 64