Conditions: Flash in iTTL Mode - not in iTTL-BL Mode.
(TTL means iTTL in this series of articles)
It is very important to remember that the Nikon TTL Flash metering system is not actively coupled to the Camera metering system. Even though these two systems use the same metering sensor in the camera, they act independently. This is definitely not intuitive and not explained well in any documentation that I've read. It is alluded to in the Nikon CLS pamphlet when it talks about using the FV Lock button to meter a subject that will be off-center when the background is dark.
Note: The TTL-BL flash metering system is actively coupled to the camera metering system, and I will talk about that in my next article.
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