Figure 9.1. E-TTL is the perfect flash mode for a shoot where the distance between the subject and the Speedite changes constantly—such as a fast-paced women’s roller derby bout.
There are two great reasons to have the power level of your flash controlled automatically:
• You don’t know enough to do it yourself.
• You’re shooting in a situation where the distance between the subject and flash changes constantly.
Canon’s Evaluative Through-The-Lens ...