Thanks Nathan,
The Mistral Neb. was dithered and some of the Pencil Neb was dithered. I was having some problems getting the SkyX to guide one night so I was guiding in Maxim and capturing images in SkyX and had dither turned on but it didn't dither. I thinks it was some of the Ha subs. I have a bad column in the middle of my sensor and dithering normally removes it but it is still evident in the Pencil Neb.
Cheers
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