Speedlite 600EX-RT Key FeaturesSpeedlite Transmitter ST-E3-RT Key Features
- New wireless multiple flash system using radio wave communication
- Zoom flash head covers wide range of 20-200mm; Max. Guide No. 197 ft./60m at ISO 100
- Redesigned contact construction, improved flash head durability, and exceptional dust and weather resistance
- 18 Custom and 3 Personal Functions for creative flexibility
- Newly designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units
- Achieves a transmission distance of up to 98.4 ft. / 30m, all at a 360 degree angle
- Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter
- Supports E-TTL II flash, manual flash, stroboscopic and external flash metering
Maybe this explains why Pocket Wizards new trigger is so cheap.




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I'll see how nicely it plays with the PocketWizard FlexTT5, although my main use for the 600EX, at least initially, will probably be on-camera or via OC-E3 on a flash bracket.
