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P3D Re: On lenses

>>Challenging question:  Would you say that our definitions of normal,
>>wide angle and telephoto lenses also depend on viewing conditions?

>No I would not say so. The definition is based on the viewing angle
>of the normal human eye, which is close to 50 degrees. 

I have been puzzled by this statement.  Can you explain it a bit?
How did the 50 degrees come about?  When I look straight, my vision
is very clear at the center and fades gradually away from it.  If
I am allowed to move the eyes (but not the head) I can certainly
see much more than 50 degrees.

George Themelis


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