Bert,
These images are really interesting, great results, you have inspired me to give it a go.
Just one minor point, there is quite a lot of coma with the lens wide open - I imagine there would be much better performance with it closed down one stop...assuming your tracking is up to it, perhaps you could go up to iso800 to compensate without too much noise (I am gusssing the dynamic range loss would not be an issue with this technique), it is all a compromise I suppose...
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