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。
As described above, when you are using the flash in plain TTL mode, the flash metering system does not take the ambient into account when determining how much light to put out.
如上所述，在使用普通ttl模式时，闪光测量系统在决定闪光输出功率时不会考虑环境光。
To make this work, use the partial metering mode (or spot metering mode) over the subject where you want to lock the flash output then press the asterisk (*) button.
相机的测光方式要设置在局部测光或点测光方式，测光点对着你想要锁定曝光值的目标，按下锁定钮。
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