Re: Question on "normal" lens

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

>I probably should be speaking for him, but I think Dennis' point, in fact, 
>the point we were both making, was that a 35 mm lens of tessar design will 
>have problems covering the width of a 7 perf format.

Eric, it was you who made this point.  Dennis agreed and added:

>the 37mm focal length was a deliberate design choice.  If you measure 
>the diagonal of the 7-perf frame, it's exactly 37mm-thus it's the "normal" 
>length.

Thus Dennis' contribution is that the FL is a design choice to match
exactly the "normal" length.  My contribution is that the "normal"
length is a convention not a mathematical quantity.  The 2.5 mm difference
in FL is very small to justify anything.

Regarding resolution, I don't care what the theory is or should be, I can 
only report what I see.  And I saw that the Realist is as good as the 
Belplasca at the edges, under my normal shooting conditions.

George


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