Canon has extended its range of EOS accessories, unveiling a number of new items for its professional and mid-range EOS Digital SLRs. The Speedlite 600EX-RT is Canon’s first flash unit to feature inbuilt wireless radio connectivity. It replaces the Speedlite 580EX II (which uses infrared wireless control). Also new is Speedlite Transmitter ST-E3-RT, a slave unit which can sit in the camera hot-shoe to control the off-camera 600RX-RT. Speedlite 600EX-RT Key features Guide number 60 (m, ISO 100, at 200mm) Radio triggering with 30m range Use up to 15 units together Infra-red wireless functionality Remote camera triggering Bounce-and-swivel head with zoom control White-balance correction filters Fast, quiet recycling Speedlite Transmitter ST-E3-RT Key features Radio frequency remote flash trigger. Fire selected Speedlites from 30m away. Controls up to 15 flashguns. Remote camera triggering. Weather sealed against dust and moisture. Integrated radio frequency tri...