About f2 - f11?
f8 to f2?
from f1 to f8
I wish I remembered! (I met Matt on Tuesday, but had a few) Something around f2.8-f8?
More accurately f2.125 to f11.333.Focal length of human eye = 17mmDiameter of min. pupil aperture = 1.5mmDiameter of max. pupil aperture = 8mmApparently.
f8.3 - f2.1 all other circumstances (medications, damage, etc.) being equal.
These are all good guesses, and probably within the natural variation of eye/pupil sizes across the population. However, I'm going to go with Mel Trittin's answer based on this Wikipedia entry: http://en.wikipedia.org/wiki/F-number#Human_eye.Mel, send me your address and I'll get a print out to you.
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