On most camera formats the normal lens is defined as the the diagonal of 
the format, on 35mm that's in the 42-43mm range.  40 is closer to a true 
normal than 50mm is.  So it's not that strange.

Lucas Rijnders wrote:

>On Tue, 10 Oct 2006 21:47:05 +0200, J. C. O'Connell <[EMAIL PROTECTED]>  
>wrote:
>
>Wasn't the 40mm focal length a little odd on 35mm as well? I always  
>thought it was the focal length that allows design of the smallest  
>possible lens, given the mount specifications. If I'm not completely  
>off-base with that, it would not have changed between M and DA...
>
>Can anyone confirm or deny?
>  
>


-- 
Things should be made as simple as possible -- but no simpler.

                        --Albert Einstein



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