View Single Post
Old Oct 23, 2006, 10:13 AM   #3
Senior Member
hgernhardtjr's Avatar
Join Date: Nov 2004
Posts: 516

The human eye is 50mm? Not quite ... as an amateur astronomer, this is what my various recent (and old) factbooks list and are considered to be the accepted focal length(s):

Object focal length of the eye = 17 mm
Image focal length of the eye = 22 mm
Dark adapted eye is about an ISO of 800
MP equivalent estimate is just under 600.

Here's just one of many places to check:

On edit, here's an astronomy reference, also:
hgernhardtjr is offline   Reply With Quote