Thanks very much Kanga, Greg, Andy!
Andy, yes agreed, still fine tuning that. Used a 0.5mm shim one night, giving the shapes seen in this image, and removed it to instead use a 0.1mm ZWO plastic shim on the second night, which gave really zoomy shaped stars. Both not perfect. Thats quite a small tolerance, I'm wondering if i had it right on night one but the shape is just residual coma the coma corrector can't correct out. Anyway, have stacked a couple of zwo shims to about the 0.3mm depth to try next night out.
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