Thanks guys for the suggestions.
I will give it a go myself and let you know how I went.
Does it matter that the DSI pixels (ICX429 CCD) are a 8.6µmx8.3µm
(ie not square)....or is that better?
For the record
this is the image I mean on my website.
Open Cluster somewhere in Norma, approx declination 55 south
The titles might throw it out, I'll see if I can dig out the full res
result FIT that Neb spat out, less titles.
Cheers,
Steve