
I use this on my Yongnuo 565EX flash, not Canon. It works great. It's just a piece of hard material that attaches to each flash. It magnifies/concentrates the light so you get better coverage. This is good because it reduces the need for a high power flash and you can lower the flash output and still get good coverage. I can easily light a bird at 60,100 feet with 1/4 power. That means more shots, less cycle time, which means more shots. A must-have for those shooting wildlife with a telephoto lens.

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