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Creative Lighting System (CLS) is the technology on which Nikon's newest range of speedlights is based.

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Why is there a preflash from a built-in flash when using remote flash only?

When using Nikon D7000 with an off-camera SB600 (which cannot be used as commander) in TTL mode, the built-in flash must be opened to make it work (to serve as a commander), even if this built-in ...