[edited to add: Most of the information here have been incorporated and improved upon, in the subsequent pages on flash photography techniques. Specifically, this page discussing the use of TTL vs TTL BL is more up to date.
However, I'm leaving this page (from 2005) here as a pre-cursor to those more informative pages.]
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Nikon’s flash system is truly superb, making it possible to often achieve excellent results without the photographer really needing to understand the finer workings of flash exposure metering .. but ultimately you will achieve the most consistent results if you understand how exposure metering works, as well as having a more clear idea of Nikon’s approach to flash technology.
