Good observation, Dunk. Despite I have no spikes to analyse, the presence of faint companion with good shape and as a dot can be a good pattern.
I did the focus with BackyardEOS and lowest FWHM with a star not in binary system, but some times I am betrayed by refraction.
At Astrobin, with option of full resolution mode, you can see the photo with my Canon T3 resolution. It seems to me that was a good capture, At least for a Canon camera.
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