- You should use external flash when you are in low light conditions.
- Yes you should meter the light.
- When the shutter opens admitting light.
- ETTL is a function that measures the flash output needed for the right exposure.
- Bouncing light helps minimize shadows.
- Slave in photography is a mode that instructs a flash unit to monitor incoming light.
- You should edit your images to get them at the right exposure if you did not use the right settings while taking them.