Flash

The pros of flashing are:
1. it's add light to the scene
2. and it's freeze time, so it can eliminate blur
Cons of flashing:
1. it disturb the subject.
2. it creates an ugly lighting situation.
3. gives ur subject red eyes.
4. and it make te background dark.
it is a perfect time to use flash when your subject is in the light. what the flash will do is it will add light to your subject's face or any of the shadow part. the flash should not be use when you are trying to capture the rich color of the night like the example picture i have on top. it is an ideal situation when you do not need to use flash, because if you do, the rich dark color will be gone and it will add an ugly bright situation.