- You would use external flash when your setting is dark.
- You need to meter the flash so then you can get a good exposer.
- It syncs your flash and your shutter speed.
- ETTL means Evaluative through the lens.
- When you shoot faster than the camera sync speed you get half of the picture visible, and the other half is dark.
- Photographers use a diffuser and bounce the flash so that the light gets softer.
- A slave is a flash unit that will flash when another flash unit has an output.
- When your photo is too dark the exposure needs to be opened more and when the photo is too light the exposure needs to be closed more.