crop marks different in dvi and pdf output

[fg@fgbbs.iaf.nl (Frans Goddijn)]

As a subscriber to this list I've only just begun with CONTEXT 
and it strikes me how silent this list is. The good news about 
it is that you all probably know so much already that there's 
not much to ask ;=} 

I hope my postings and their frequency is not bugging any of you.

The crop marks have appeared after I changed my input file to be:

\gebruikspecials[tpd]
\stelpapierformaatin[A5][A4]
\stellayoutin[plaats=midden,markering=aan]
\toonkader
\starttekst
testing...
\stoptekst

so the "[plaats=midden," was missing in my earlier try today. 

Still, there's a question left, because with this option 
on I do see crop marks, but (when creating PDF output) the 
page isn't shifted to the middle of the A4 output. The page 
is about 2 inch too far to the right and to the bottom so part
of what should be printed is white. There's a white margin of 30mm 
on the right of the paper and a white 44mm on the bottom of the 
A4 paper wiping out the print. 

Remarkably, if I leave out the line "\gebruikspecials[tpd]" and 
I only generate DVI output, then there's no problem at all, 
the page is nicely centered and the crop marks look great...

I checked out the file PDFTEX.CFG and it has:

******************
output_format 0
compress_level 9
decimal_digits 3
page_width 210mm
page_height 297mm
horigin 1in
vorigin 1in
map pdftex.map
*****************

This suggests the problem is not really a CONTEXT problem, 
but to be found in the connection to PDF-tex. 
Can I still ask about it here?

If I hack the "horigin" and "vorigin" lines to be

horigin -2mm
vorigin -12.5mm

I can get the page somewhat centered om the larger A4 but then
the sides fall off the white side margins of about 30mm and only 
about a millimeter of the the top left crop mark is shown...

Talking to Siep Kroonenberg, I mentioned my problem and she suggested I
comment away the horigin and vorigin lines in PDFTEX.CFG. She offered me a
nifty batchfile going like this (must all be on one line):

pdftex &cont-nl
\pdfoutput=1\pdfpagewidth=8.26in\pdfpageheight=11.69in\pdfcompresslevel=0
\input %1

Now, the A5 is again neatly centered on the A4 page, but still the outer
30mm of the sides of the A4 is white and the top 43 mm is white, same
below, knocking out the left- and rightmost vertical margin lines and also
knocking out the crop marks. Where they should be, there's white.

Any ideas anybody?

Met hartelijke groet!

 Frans Goddijn   | bbs: +31 (0)26 3217041
 Postbus 30196   | email: fg@fgbbs.iaf.nl
 6803 AD Arnhem  | tel: +31 (0)26 3219342
 The Netherlands | http://www.iaf.nl/Users/Meridian 
--- timEd/2 1.10+
 * Origin: FGBBS at +31 26 3217041 (314:85/0)

Met hartelijke groet!

 Frans Goddijn   | bbs: +31 (0)26 3217041
 Postbus 30196   | email: fg@fgbbs.iaf.nl
 6803 AD Arnhem  | tel: +31 (0)26 3219342
 The Netherlands | http://www.iaf.nl/Users/Meridian 
--
You are what you is