Wireless flash triggers (aka radio slave triggers) are compared, including PocketWizard, Cactus, Yongnuo, RadioPopper, Cybersync, Skyport, and more. Also, see my video course on shooting headshots and portraits with small flashes at SteeleTraining.com. Links for radio triggers: Pocket Wizard Plus II (Sync Only) http://www.amazon.com/gp/product/B000... Pocket Wizard FlexTT5 Transceiver For Canon (TTL Flash Metering) http://www.amazon.com/gp/product/B003... Elinchrom EL 19360 Skyport Universal Trigger Set http://www.amazon.com/gp/product/B000... Cowboy Studio NPT-04 Wireless Flash Trigger http://www.amazon.com/gp/product/B002... Cactus Wireless Flash Trigger Set V4 http://www.gadgetinfinity.com/product... Yongnuo Store on Ebay (you have to search for the right trigger for your camera) http://stores.ebay.com/hkyongnuophoto... If you buy from my Amazon links you help me produce these tutorials.