Archived posting to the Leica Users Group, 1997/08/12

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Subject: Angle of view of the eye
From: Erwin Puts <imxputs@knoware.nl>
Date: Tue, 12 Aug 1997 18:59:58 +0200
 
The notion thet the 'normal' angle of view of the view is equal to that
of the socalled standard lens, is believed by almost everyone. It is
however false. Look at any physics or science book  and you will find
the true scientific figure: the eye has an angle of view of 120 degrees!
As anyone who looks straight  ahead can ascertain for him/herself.
A 90mm lens indeed gives a perspective that is pleasing for the eye, but
the real focal length of the eye is 17mm.
Erwin