That's a great shot, I really like the colour! You've inspired me to try process bi-colour.
One thing to keep in mind re-stars being a little out of round.
This could be due to having a modded camera.
I believe that it if the sensor is not level with the camera's flange, stars can look a bit out of focus or look like there is some flexure in the imaging train. Some parts of an image might look more or less out of focus as well.
I might be wrong though, just going by my personal observation
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