Thanks Mario and H for explaining this for me.
I will definitely give this a go next time to make sure I am spot on. I must also remember to collimate more accurately too as I noticed the twin vanes on the diffraction spikes also and I didnt really check this too well as I was focused on the guiding scenario for so long.
Thanks for the tips, the "Octane 15" is going into a file which I can call up next time for reference and I dont have to go digging around for it.
Cheers
Chris
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