Hello Bo,
Do you get these markings with both/all your cameras? That would be the first thing to check Vs whichever camera gave you the image you posted. Almost looks like a combination of a water with accumulated dust stain. Which scope gave you the mark - The Meade 10? Then I would look for like carefully for similar shape marks on the mirrors with torch as well as for marks on the imaging sensor of the cameras, etc..
Good hunting
Best
JA
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