I think I have finally got my system under control.
This is a large X1.5 native pixel size image of Carina in 3nm NII 7MB
http://d1355990.i49.quadrahosting.co.../CAR_NII_L.jpg
The data is 17x16 minutes (4.5 hours) with the camera at -35C.
Here is a full resolution compressed 16 bit tiff file to play with. It is untouched after correcting for darks and flats and stacking. The resulting fit file was used to produce a B&W tiff with the fit assigned to all three colour channels.
The file is 218MB uncompressed. Here is a zip version 50MB
http://d1355990.i49.quadrahosting.co..._NII_L_tif.zip
I would be very interested to see what others can get out of this data.
Always remember that the neatest correct entry wins!
I am in the process of collecting SII, HA and OIII and I will put them up as well.
Bert