I just got the latest document in pdf form.
It has a few minor changes:
https://drive.google.com/file/d/0B2V...ew?usp=sharing
I think what I need to do is to create an external potentiometer
that screws into the housing so I can adjust it while under the stars.
It would be too much mucking around to undo & keep adjusting all the time in order to test it.
cheers
Allan
This is what I'm getting now:
The Running Man Nebula - stack of luminance -with the black lines
exaggerated using HDR toning.