TTL flash exposure measurement takes the risk out of flash photography.
TTL闪光曝光测量采用的闪光摄影的风险了。
When you're ready, you might want to learn more advanced techniques using flash Exposure Compensation and general Exposure Compensation controls in conjunction with TTL flash.
当你准备好时，你可能想学习更进阶的技巧，结合TTL闪光灯使用闪光灯曝光补偿和一般曝光补偿。
These controls allow you to make easy adjustments to flash and overall exposure while still letting the TTL system do most of the thinking for you. Very handy indeed.
这些控制允许你轻松地调整闪光灯和相机曝光，不过主要工作仍然交由ttl系统完成。
Through-The-Lens (TTL) mode, on the other hand, puts the flash unit’s output under the control of the camera and flash.
另一方面，TTL模式是由相机和闪光灯决定输出光量的。
So, if the ambient light is fair or bright, and you want to use the plain TTL mode, you should reduce the flash power by setting some negative FOLC to avoid overexposure.
因此，若环境相当亮，又要使用TTL模式，就需要设置负的FOLC降低闪光灯输出，避免过曝。
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-TTLII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。
The TTL BaLanced fill (TTL BL) mode is the most complicated flash mode on the Nikon Speedlights. This mode is (so far) not found on any third party flash units.
TTL均衡补充（TTLBL）模式是尼康高速闪光灯最复杂的模式，该模式（目前）还没有其它闪光灯使用。
The TTL BaLanced fill (TTL BL) mode is the most complicated flash mode on the Nikon Speedlights. This mode is (so far) not found on any third party flash units.
TTL均衡补充（TTLBL）模式是尼康高速闪光灯最复杂的模式，该模式（目前）还没有其它闪光灯使用。
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