Quote:
Originally Posted by theodog
Great work Terry. 
I had a dabble with the star analyser a while ago. I still have it and your work has me thinking about doing some more.
I too used the grid in my filter-wheel, difficult to align the lines with the camera (ST-7).
Great work, look forward to seeing more. 
Now off to check out the book site.
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You don't need to align the lines with the ST7 (although this does make it easier)
You just open the image in Iris, select a region of the spectrum and issue the command "L_ori"
It then tells you the angle that the image needs to be rotated. You then use the "ROT" command with this angle in it and the spectrum is nicely horizontal.