[NTG-context] Rescaling pages

[Olaf Mersmann]

Hi List,

I have a booklet typset on A5 paper with an A5 pagesize (one page per
sheet). The printer-shop wants the pages enlarged to A4, so that they
can scale them back down to A5 and imposition 2 on an A4 sheet. Don't
ask me why they want this. I don't know. 

Is it possible to easily do this from within context or what are my
options?

Any help would be appreciated.

Sincerely,
Olaf