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I am very interested in this shot as I am considering a Polarie.
Are you sure that is rotational errors rather than coma? The trailing seems to radiate from the centre. I have seen trailing even on 30 seconds and it is true that further away from the SCP trails more than closer in so not 100% sure here. And I did not notice anything unusual in your other 14mm Samyang shots.
Still it does show a lot of potential.
Greg.
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