Avoid Red Eye

The LiveScience website reports that an Australian physicist has calculated the number of photos of a group that need to be taken to ensure at least one frame that’s free of blinking.

“For groups of less than 20 people, divide the number of people in the group by 3 if the light is good or by 2 if the light is bad,” Barnes told LiveScience. “Take that number of shots and you will have a better than 95 percent chance of getting at least one good one.”