The Canon ST-E3-RT Speedlite Transmitter makes sophisticated remote flash photography easy. Fire up to 15 flashes at once and control settings from a distance, even when your sight is blocked by a corner. You can fire up to 15 cameras at once from up to 30 metres for complex, synchronised shooting. The transmitter is sealed against dust and moisture to the same degree as a professional EOS camera, meaning you can be outside without fear of damage. Finally, a back-lit LCD control screen is easy to read and use.BenefitsControl compatible Canon Speedlite flashguns over distances up to 30 metres. Direct line of sight is not required, as the transmitter triggering operates reliably even when outdoors and around cornersProfessional photographers can create intricate multi-flash set ups, triggering up to 15 Speedlite flashes with this single camera-mounted transmitter. This makes exposure control easyYou can trigger an EOS camera from a second unit or compatible Speedlite flashgun. Up to 15 c