Canon's E-TTL II even measures the distance to the main subject and that also becomes part of the evaluation taking place.

佳能的E - TTL II甚至可以测出相机和主要被摄对象间的距离并将此作为测光的考虑因素之一。

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Furthermore, with E-TTL II cameras, flash metering is no longer linked to the AF point you're using - this reduces exposure errors if you prefer to lock focus and re-compose.

另外，使用支持e - TTL II的相机时，闪光的测光不再与当前对焦点联动-这降低了锁焦和重新构图时发生曝光错误的机会。

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