-When would you use external flash? you want to change the angle of the light to get better results.

Do you need to meter the light if you use flash? Yes

Do you need to meter the light if you use flash? Yes

What does ETTL mean? Evaluate through the lens

What will happen when you shoot faster than the camera sync speed? When you shoot faster than the camera sync speed, the second curtain starts to close before the first curtain has fully opened,

What is a slave? A flash unit

What should you do if your image comes out too dark or too light? Use the exposure compensation setting on your camera to correct for under or over exposure.