Saturday, April 12, 2008

Quiz #3


This one comes courtesy of Matt Stuart:

What is the f-stop range of the typical human pupil?

First correct answer wins a print.
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8 comments:

  1. Mezz DaviesApril 13, 2008 at 9:05 AM

    About f2 - f11?

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  2. AnonymousApril 13, 2008 at 9:26 AM

    f8 to f2?

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  3. AnonymousApril 13, 2008 at 10:09 AM

    from f1 to f8

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  4. J. KarankaApril 13, 2008 at 10:56 AM

    I wish I remembered! (I met Matt on Tuesday, but had a few) Something around f2.8-f8?

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  5. Mezz DaviesApril 13, 2008 at 10:59 AM

    This comment has been removed by the author.

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  6. Mezz DaviesApril 13, 2008 at 11:20 AM

    More accurately f2.125 to f11.333.

    Focal length of human eye = 17mm
    Diameter of min. pupil aperture = 1.5mm
    Diameter of max. pupil aperture = 8mm

    Apparently.

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  7. Mel TrittinApril 13, 2008 at 2:50 PM

    f8.3 - f2.1 all other circumstances (medications, damage, etc.) being equal.

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  8. Blake AndrewsApril 14, 2008 at 7:04 AM

    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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