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Thanks. The photo wasn't taken close to twilight either. Astronomical twilight ended at about 18:50. This picture was taken about 2 hrs after that.
It is a 2.5 min exposure which has picked up the airglow.
I have unmodded Pentax K1 and K5 bodies. My mate had a modded Canon 6D and an unmodded 5Dmkiv. The pickup by the cameras was quite different. One night the 6D would pick up strong airglow and the Pentax didn't, other nights the Pentax picked it up more than Canon.
Joe
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