This could be helpful when critical reproduction of tonal values is essential. 
I could see comparing a midrange value to  a zone V grey card read before 
shooting, then matching the level after converting.  It could also be valuable 
in terms of making sure specific highlights or shadows are placed correctly.
Paul
 -------------- Original message ----------------------
From: Godfrey DiGiorgi <[EMAIL PROTECTED]>
> I've been using this for a bit to work on learning exposure with zone  
> system ideas in mind. Thought others might find it useful or have  
> interesting ideas about it too.
> 
> http://homepage.mac.com/godders/zone-system-pixel-values.jpg
> 
> Godfrey
> 
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