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Does anyone know what the strange diffraction spikes are in this image? I know the star Alnitak is pretty bright but wasn't expecting this.
I've never seen this happen before. Is it an SCT thing, or a MY SCT thing?
I've seen straight diffraction spikes, but never curved.
Is there anything I can do to stop this? Could it be a collimation issue? I did check before I started imaging, but thought everything looked ok.
My scope is a Celestron C9.25 XLT, and I'm using a f/6.3 corrector/reducer with modded Canon EOS 600D.
Thanks in advance