I’m sure that we’ve taken at least one group photo that even if everyone stays perfectly still, there’s always someone who blinks. Nic Svenson comes to the rescue with an article explaining a theory by CSIRO physicist Dr Piers Barnes on how many shots you should take to get one where no-one’s blinking..
“..Piers then figured out how many shots I’d need to be 99% certain of getting a good one. He found that photographing thirty people in bad light would need about thirty shots. Once there’s around fifty people, even in good light, you can kiss your hopes of an unspoilt photo goodbye. Piers also came up with a rule of thumb for calculating the number of photos to take for groups of less than 20: divide the number of people by three if there’s good light and two if the light’s bad.”
See also: Photography Tips