ExpoImaging Rayflash, Ring Flash Adapter The Ray Flash is a unique adapter for your hot-shoe flash unit it contains no electronics, and requires no cables Weight 16 oz, 4 1/8" internal diameter (large enough to accept almost all professional lenses from Canon). Light output: only one stop of light loss from your flash's standard output. The Ray Flash does not change a flash's color temperature. Exposure control: All TTL functions operate normally when using the Ray Flash: * Please Note: This Ring Adapter WORKS ONLY ON Canon 5D,20D,30D,40,And Only on the 580EX II Flash
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