 "Canon ST-E3-RT Speedlite Transmitter"@en " Canon Transmitter Radio-controlled two-way transmitter for multiple-flash setups at Crutchfield.com "@en
"Radio-controlled two-way transmitter for multiple-flash setups"@en 
 "Extender EF 2x III"@en "Canon Extender III | Canon Online Store"@en
"Extender EF 2X III"@en 