issue with imposition

["Pablo Rodríguez" <oinos@web.de>]

Hi there,

I would like to use the imposition capabilities from ConTeXt to be able
to print a PDF book in a standard laser printer. To save paper, I use 
the 2UP arranging option thanks to this code from the wiki:

\definepapersize	[filius][width=135.9mm, height=231.8mm]
\setuppapersize		[filius][A4,landscape]
\setuparranging		[2UP,doublesided]
\setuplayout [backspace=0pt,
     topspace=0pt,
        width=middle,
       height=middle,
     location=middle,
       header=0pt,
       footer=0pt,
       grid=no, marking=off]
\starttext
\filterpages[ZittrainTheFutureoftheInternet.pdf][4:351][height=21cm]
\stoptext

The PDF file can be downloaded from
http://futureoftheinternet.org/static/ZittrainTheFutureoftheInternet.pdf.

The issue here is that I get a resulting paper size with the filius 
height and not with 21cm from A4.

I have tried have the output in a standard A4 paper size, but all that I 
got is a scaled down PDF. I would like to avoid scaling the document if 
that were possible.

Is there any way, given the example above, to impose the filius paper 
size on a real landscape A4 without having to scale down the PDF document?

Thanks for your help,


Pablo

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