Using off camera flash - particularly outdoors and in sunshine - requires compromises due to technical limitations. However, I've just invested in a set of Pocket Wizard MiniTT1 and FlexTT5 radio triggers (£400). This amazing technology means I can use the ETTL auto exposure abilities of my camera and position my flash units anywhere I choose to get the shot - with no compromises. The units are also unique in that they optimise the output from my flash units so I get faster recharges, more light and less power drain - meaning I can work faster with less interruptions on the technical side. Unlike Canon's own solution for wireless ETTL flash (STE-2)- the PocketWiazards increase the flash output when working at faster shutter speeds and wider apertures - so I can now use flash in bright daylight and super wide apertures. Being able to effectively use flash lighting at very fast shutter speeds is also plenty helpful in general.
Not content, PocketWizard have also included a 2 stop boost to the ETTL pre-flash burst meaning exposures in challenging situations (bounced flash / inside a softbox etc) are given more accuracy without needed FEC.
Using the beta firmware, the unit's worked perfectly straight out the box. The system now also supports an optimised version of rear curtain flash sync (Canon's own implementation seems to be flawed when used with the 5D Markii).
My early tests with the PocketWizards outdoors and my 580EXII flashes are okay. Seems to be reliable up to 28m away - which is more than I'm ever likely to need but much less than the advertised 240m. If you need full range you'll need to use a 430EXII flash or purchase the upcoming RF shield for the 580EX flashes for a 3X/5X boost in range. I'm told the AC5 sock shield will cost £25 - which is harsh considering registered USA customers get it for free and ultimately this should be included in the box anyway.
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