No worries Roger, here are a couple, a straight jpeg from a month ago and the second is a RAF I banged out quickly in LR the other night when time was to spare. I'm yet get the time to really process them and establish a preset so please no-one judge them as they are thanks!
It gives an idea of coma, not shocking.
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Both are the 18mm at f2, around iso 1600 or 2000, 30 secs via remote release. Not wide, but a nice scale for detail I think. Then, there is the crop and stitching option anyway. That would be the go.
Send us a PM with email for a RAF if you like.