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A very striking image.
If you want to help correct elongated stars here are 2 techniques in photoshop:
1. Use the smudge tool and set it to a circle large enough and then nudge the edges of the elongated stars and push them into a round state. It helps if you zoom in and make the stars large. You can also make the circle of the tool smaller and push out from inside the star to round it out and that can look more natural as it doesn't affect the secondary halo of the star.
2. Another technique is to make a duplicate image. Set it to darken blending mode. Now select filter/other/offset. Experiment with different horizontal and vertical offsets to help correct the elongation. In your image the elongations are mainly horizontal.
You can also lasso areas you don't want affected by the offset as it will tend to smear detail slightly.
You can also fine tune it by selecting edit/fade offset after you have offset it to and you cna use the slider to reduce the effect even more rather than the increments of 1 pixel allowed in the offset filter.
Also using the minimum filter will reduce stars in general and will minimise the elongations but you can overdo that filter as you can overdo the above.
Greg.
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