every day i write the book

Don’t you hate when you take pictures of groups of people and someone always blinks? I found an article today:
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[...]