[away3d] ZoomFocusLens question

[Michael Iv]

Hi all! I can't get the visual difference using PerspectiveLens vs  
ZoomFocusLens. I know that the class difference is the perspective  
calculation as it is seen in the source code of these classes but I  
have tweaked it in different ways and it behaves just like the  
PerspectiveLens

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