Since LPA Design released the PocketWizard MiniTT1 and FlexTT5 for Canon last year, the wireless radio remote system has been dogged by criticism that the working range is too short when the flash attached to the remote FlexTT5 is one of a trio of Canon Speedlite models that emit radio frequency (RF) noise in the operating range used by U.S./Canada PocketWizard devices. This prompted the company to develop an internal RF noise reduction modification for Canon's current Speedlite flagship, the 580EX II, as well as two RF noise shielding accessories, the PocketWizard AC5 and AC7. All three options extend the usable working distance dramatically. Each comes with its own set of side benefits and tradeoffs too. Here's a rundown of the current spate of range-improving options and how they compare.

More...