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.
Sweet little setup by Vimeo member kaydawgy shows a triple flash bracket with Yongnuo Speedlites and Yongnuo RF602 wireless flash triggers. As mentioned in the video, instead of using a single flash at full power, you can use several flashes at low power. This will give you faster recycle times and a broad light source for softer light. This also helps to keep your flashes from overheating too quickly. That large 60" shoot through umbrella also enhances to create the large soft diffused light for portraits. The triple flash bracket can be found (click here).
Triple Flash Bracket
The Yongnuo RF602 wireless triggers work great for firing flashes off camera, so if you're in a dark venue (i.e. wedding reception), many photographers will spread flashes around the room. Clamp them to the ceiling, throw them in the corners, or use them as backlighting to silouhette subjects on the dance floor (cliche I know). The RF602 triggers also come with a cable to fire off mini plugs and 1/4 plug studio strobes, and an optional cable (purchased seperately) turns them into a remote shutter. These handy little wireless triggers can be found (click here).
One thing you need to be aware of with this setup, is that these Yongnuo triggers don't communicate ETTL and can't support HSS (high speed sync) with the Flashes. You'll be working with the flashes on full manual mode. The triggers can only sync to about 1/200ths shutter speed. Important Note: So, if you're at 1/200ths and F/4 to blur out your backgrounds on a bright day, you'll be very much overexposed. To shoot with a shallow depth of field, grab yourself an ND filter. If you don't have the ND Filter to cut out the bright sun, you can still use 1/200ths shutter speed and close down your aperture to say F/16 (no more blurry backgrounds). If you happed to be working at an indoor studio type setting, you should be fine at that shutter speed. You can find a variety of different Yongnuo flash models (click here). [Thanks kaydawgy]