>  There are several reasons why you don't want to do that.
>
> http://wiki.povray.org/content/Knowledgebase:Language_Questions_and_Tips#Topic_19

Did you write that FAQ? You seem to promote it an awful lot.  It also seems 
to assume you've already completed your scene, using "right 
x*image_width/image_height" is very useful whilst developing a scene, as it 
saves you having to adjust the camera block each time you want to render at 
a different aspect (I assume nearly everyone renders to square pixels).

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