Thanks guys for your replies.
Have a look at the pics on this page:
many of them are taken with a Hypergraph 16” f8
from the Tivoli farm - high altitude dark site in Namibia Africa.
http://astrofotografia.com.pl/galeria.htm
They are incredible pictures.
However:
The only better pics I can find are from this site from Chile:
http://www.chart32.de/index.php/nebulae-n
32” Astro Optik Philipp Keller 80cm robotic classical Cassegrain with 3-Lens corrector.
Notice that it’s a much larger telescope so you’d expect better but it’s a Cassegrain
so how come it’s better?
According to the Hypergraph site it should only be a 10th as good.