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Imagine an exposure computer so advanced that it uses your eyes as a sensor. The processing unit is as powerful as your brain. The computer is accurate over a light range from reflected starlight through the light produced in a hydrogen fusion reaction. This computer weighs nothing and operates without batteries. It comes with instructions to allow you to implant the capabilities of the computer directly into your own memory so you can accurately judge a correct exposure by simply looking at the type of light that the subject is in. You are using this computer right now!
What follows was written in spring, 2004. While the theory of TTL remains the same, in 2008 we're in the iTTL world of the D3. For a more up to date explanation of using iTTL, you'll want to head to the D3 site.