If you're a bit late on this article, the new Yongnuo 565EX flash can be triggered by a Canon remote. So questions came up whether the Yongnuo YN-565EX Flash will work with the Radio Popper PX wireless triggers. Indeed it does and i've run some tests. There's no reason it shouldn't because the Radio Popper PX system takes the Canon infrared, does some magic, and then sends the very basic infrared back into the flash. The problem you'll run into is the standard RP shoe mount is not aligned. Never fear as a bit of Velcro will do just fine lining up the infrared ports.
Some of you might be wondering why you would need the Radio Popper system? Well let's start out by saying if you don't shoot in High Speed Sync, then you probably don't need it. You could do just fine with the RF603 triggers and switching the flash to manual mode. Instead of relying on Canon's infrared signals (which requires line of sight and gets pretty spotty outdoors), you could get more consistent results with a true wireless system. The only other benefit to using the Radio Poppers is if you want to control flash compensation straight from the camera (instead of walking up to the flash), or if you are managing power ratios and groups of flashes. If you're a bit new, my suggestion is to just go with the RF603 setup and learn how to work the flash manually. You'll actually gain a good understanding of flash.
The Yongnuo YN-565EX ETTL Flash for Canon and Nikon is so far very nice. Yongnuo has really stepped up their game with this new YN565EX, providing a solid build that feels very similar to the Canon 580EX II which is the top notch in Canon gear. Many other features only available in Canon's top flashes are also included in the YN-565EX such as PC sync and External Power port option. For an on camera flash with Canon DSLRs, it works transparently for the average consumer. In ETTL mode, communication with the camera are recognized including Zoom Distance, Aperture, and Flash compensation. Note: This flash does not have an HSS option.
When used off camera, the flash can be set to Slave mode and triggered from a variety of Canon Master or Nikon Commander type triggers. Although you can fire the flash remotely, I need to do more testing to see if ETTL is still working wirelessly. I noticed the flash was not picking up my flash compensation, zoom, or aperture. It seems to have defaulted to a more manual mode but still fired as a slave. Maybe i'm missing something in the settings? Since this YN-565EX can be triggered through a Canon Master, this should (ideally) work to be triggered from the 'built in' wireless triggers from the Canon 7D and Canon 60D cameras (turn on Flash trigger in menu). I think the T3i may also have this option. In any case, the many features, build quality, and price makes this a perfect flash for on camera use, and for experienced flash photographers the manual modes 'off camera' work excellent too. You can find them online via eBay (click here).