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The Nikon Creative Lighting System, 3rd Edition by Mike Hagen

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What are CLS and iTTL?

In Nikon’s terminology, CLS and iTTL both frequently refer to the same thing. The two terms are often used interchangeably, even though they stand for different words.

CLS stands for Creative Lighting System and references the entire Nikon wireless flash system. It includes the flashes, cameras, and accessories that all work together in the system.

iTTL stands for Intelligent Through The Lens. The “i” does not mean intelligent in the sense that the flash system is really thinking but rather that the system communicates between the flashes and the camera body with wireless flash pulses. These pulses of light ...

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