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The diffraction spikes are caused by the collimation.. it seems that the collimation has somehow gone out slightly since you picked it up... the oval halo's are caused by reflections inside the scopes baffle tube.. these are easily fixed by flocking the primary baffle tube... It would take less than an hour to complete the flocking, and that problem would be gone...
Guiding looks spot on...
Next weekend I'll explain the flocking procedure a bit more, and if you like we can possibly get the mod done within a couple of weeks if you want a hand....
Collimation I can sort out this weekend for you.. Takes 5 minutes and will fix up those diffraction spikes...
Alex.
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