Earlier this year I had listened to this article's summary on the ABC Science Show. Dr. Piers Barnes was explaining how many shots of the group you'd have to take in order to have captured one without someone in the group blinking during the shutter exposure.
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.
Having just come back from the photography studio for our family holiday "photo shoot" I can attest that for our group (4 people) these probability calculations hold up.
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