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Note however that "Optical Slave" as mentioned in my original response and PocketWizard FAQ is not the same thing as Canon's Infrared remote system. The PocketWizard FAQ is referring to the built-in optical slave on most studio strobes oraccessoryhot shoe optical slave (e.g. http://www.amazon.com/dp/B0028DM1YA/?tag=sab02-20). It also recommends using PocketWizards for each strobe/flash/Speedlite rather than relying on optical senors (because they make more money that way), and it avoids other shooters or light sources from misfiring your strobe/flash/Speedlite.


If you do place a Speedlite in the hot shoe of the your MiniTT1 mounted to your camera as you suggest you can partially use Canon's Infrared system, however not for triggering, but rather to control Speedlite output ratios. When using PocketWizards in ETTL mode, the flash output is automatically divided evenly between the number of Speedlites/PocketWizards. Using either select Speedlites, Canon ST-E2 transmitter or (soon to be released) PocketWizard ZoneController attached to either a MiniTT1 or FlexTT5 attached to a camera will enable the ability to vary the flash output ratio of two or three zones/groupings. Ratio information is transmitted with via IR, so it requires direct line of site to work and may not work in bright light conditions (e.g. sunlight).
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