Sabtu, 12 April 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.

8 ulasan:

Mezz Davies berkata...

About f2 - f11?

Tanpa Nama berkata...

f8 to f2?

Tanpa Nama berkata...

from f1 to f8

J. Karanka berkata...

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

Mezz Davies berkata...
Ulasan ini telah dialihkan keluar oleh pengarang.
Mezz Davies berkata...

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.

Mel Trittin berkata...

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

Blake Andrews berkata...

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.