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What is the difference between TTL, A-TTL, E-TTL and E-TTL II flash?

April 26, 2017difference e-ttl Flash ii TTL

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What is the difference between TTL, A-TTL, E-TTL and E-TTL II flash?

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These four modes are all forms of through-the-lens flash metering used by Canon cameras. Older EOS film cameras support TTL and A-TTL metering only. Newer film models and almost all digital EOS cameras support E-TTL flash metering. E-TTL II is available on most EOS cameras from 2004 on.