When you first buy a camera flash and turn it on, the flash is pre-programmed to start in TTL mode. TTL is an acronym for “Through the Lens.” This technical term means nothing more than that the flash automatically chooses how much power to fire depending on the scene in front of the lens (what it sees “through the lens”). Some camera manufacturers call it E-TTL, or I-TTL. None of these names really matters. Let’s just call it TTL.
This technology is a lifesaver, and it works extremely well in most cases. By having the flash mode set to TTL, you can turn on the camera and the flash, then fire the shutter ...
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