After sorting out my focusing problems I managed to capture this last night.
1mb
I have updated it to the latest version
http://users.bigpond.net.au/avandonk/Carina_small.jpg
Details Canon 5DH with 300mm F2.8L @ F2.8,LPR filter, in cam NR on,ISO 800 30X120 sec, Raw to 16b Tiff, stacked with Registar, levels etc in Photoshop, GradientXTerminator to remove vignetting. FOV 6.87X4.58 deg.
It was difficult to process because of the vignetting but I think I am nearly on top of it.
Might try again tonight at a lower ISO.
The quality of this lens never ceases to amaze me especially when in very good focus.
The original jpg is 11mb !
Bert