Here's a possiblity.
Scale the media along with container object scale as follows.

 note! OS:SS of 1.5:.75, 1:1, .75:1.5, .5:2, .25:4, etc. approximates unioned 
equalization
 OS:SS of 2:.75, 1:1, .75:1.25, .5:1.5, .25:2, etc. approximates intersected 
equalization

This is from a media test file I'm using to figure media out better.
OS is object scale, SS is scattering scale (color*SS).
Unioned and intersected media is described in the help file under Multiple 
Media and Density.
I'm putting the test file onto my web site so anyone can check it out. There 
isn't any guarantee I've got it right yet, but from what I've seen the scaling 
does a fair approximation in the case of the test scene file concerning 
multiple media or density, and scattering.

 http://members.aol.com/xyzunknown/mediatest.htm

Message <3661c09f.0@news.povray.org>, Lars Wolter  typed...
>
>
>Hi is there any way to scale Medias after declaring them without loosing
>some of the Media Effects ?
>
>greetings by Lars Wolter
>www.snafu.de/~lars.wolter
>E-Mail : lar### [at] snafude
>
>
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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