Chapter 3: Understanding E-TTL versus E-TTL II Flash

ETTL II uses zones and distance for greater flash accuracy

The newer camera bodies have E-TTL II built in when using the proper Canon flash (Canon flash units designated EX) and Canon EF lenses. This improves problem situations where the flash gets fooled. The flash now adds a distance measurement to the subject taken from the lens to come up with a proper exposure. And this added information helps the flash make more accurate exposures. Yet, as a portrait photographer, I don’t use the flash on-camera where I point the flash at the subject (unless they are moving). I typically use bounce flash or take the flash out of the camera’s hot shoe and use off-camera flash. In both these situations, the flash does not use distance in its calculation. It basically acts somewhat like the previous E-TTL system in that it is less accurate. But that is ok as I need good light angle and consistency than accuracy on the first push of the shutter button.