Since It seems that I'm alone on this forum, I will answer to myself
:-)

 To deal with the different aspect ratios , it's not necessary to have
different lens parameters. Just play with the crop factor.

Now, the only way I found to have variable crop factors, is to have one camera 
variant  by aspect ratio.
Each variant having a different crop factor ...

That's a little heavy and the app I use (rawstudio) does not seems to support  
camera variants ....
So the only solution for me now is to have a different  lens for each aspect 
ratio with a different crop factor for each lens.
Even more heavy and strange on a fixed lens camera !

 I think the ideal  solution will be to accept  more than one
cropfactor element by camera and add a aspectratio attribute to
cropfactor element.

Something like :
<cropfactor aspectratio="4:3">4.7</cropfactor>
<cropfactor aspectratio="16:9">4.1</cropfactor>
......



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