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Title: Danger Will Robinson
Review: I needed a flash ring to do some close-up photography and borrowed a friends Opteka RL-500. I have a Canon XTi and wanted to check compatibility before I fired it up. I work with electronics and wanted to see what voltage ended up on the shoe when the unit was fired. I measured 170V. The maximum voltage a Canon hot shoe should have applied to it is 6V. Use this unit and you could blow your hot shoe. I didn't risk it and went with a Canon flash ring (and it has worked perfectly!).
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