Beaudiful Ed.
Looks like pretty perfect focus to me. One think I've notice now that I've seen them on a number of different appature telescopes is the wider the App the sharper and more defined the spikes.
though I'll have to do an experiment up here on one night with a number of scopes to judge how much impact seeing condition have.
I might get the chance in the next month to try it with a 4" refract 5" Nexstar, my 8" meade and the 11' Celestron, all on the same night. (I'd better get building some smaller masks) If I manage it I'll post the images for a comparison.
Thanks for the chance to see your results.
ps Mark the diffraction spikes are a result of the triangular shaped holes in the mask.