Canon's 2nd generation, high-end full frame digital SLR camera, released in 2008.
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Why do my Cybersyncs fire my Sunpak flashes with the test button, but not the shutter release?
During wedding receptions, my Sunpak 383s fire very inconsistently. Every time I press the test button with the Cybersyncs, they fire every time. When I press the shutter button, they don't fire.
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