http://www.usa.canon.com/cusa/support/professional/professional_cameras/flashes/speedlite_540ez?pageKeyCode=writeReviewPage
Speedlite 540EZ
8158
Features
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Increased flash output.
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18mm super-wide-angle coverage.
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Improved flash exposure control reliability.
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Compatiblilty with EOS 1N 5-point AF and 3-point TTL flash metering functions.
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Improved operability.