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Your not the only one who has seen coloured diffraction spikes in images
My images of Nebula ( eg M42 ) which have larger stars in the background and therefore very long diffraction spikes usually have RGB colours emanating about half way out along the diffraction spike until it fades into interstellar space again
I use a 6” f6 newt with DSLR and a 8” f5 newt with DSLR
It’s more prominent on the 8” f5
I’m just putting it down to the cameras sensor picking up some Ha OIII etc..in the nebulosity cloud behind the diffraction spike as the stars white light intensity diminishes outward into interstellar space
That’s my theory anyway , could be totally barking up the wrong tree !!!
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