B013CSIPGC Coco CR-580-H Ring Flash Adapter Rig for The 580EX II External Flash on The EOS 1D, 1DS and 1V DSLR Cameras

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Converts the EOS 580EX II Shoe-Mount Flash to Professional Ring Flash
Provides Even, Soft Light
Doesn’t affect flash’s color temperature
Minimal light loss from the flash’s standard output
Attaches and removes in seconds