"Thomas Lake" <tla### [at] homecom> wrote in news:3b99b42c@news.povray.org:

> I'm really not the one to answer but could it be because when you
> switch D to 2 not only does the sphere get bigger, but the camera moves
> back to 1500 units.

Doubling D doubles both the size of the blob component and the distance 
between the blob and the camera.  A object of radius R at distance D will 
appear to be the same radius as an object of radius R*2 at distance D*2.  
The image should look the same for any value of D.

Try it with a non-blob sphere if you don't believe me.

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