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It seems to be in all my images from last night. It's only in the ones with a bright star near the centre. I thought it might have been the new fish tank inside with its 5800k grow light (it's blueish), but the images after I turned it off still have the blue mark. I also noticed that if an image had star trails then so did the blue mark. Only thing different I did from any other night was have the laptop out with me trying out DSLRFocus (works a treat). No blue tooth but I do have a wireless network router. See what happens next time.
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