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OK all .. I have probably confirmed that it is ice, well I guess Im hoping. Earlier yesterday evening I was imaging M20 and I had to do a meridian flip. After that the image changed orientation but low and behold those marks in the image are in exactly the same places, so it is definitely something to do with the camera. I saw it last night and just thort it was a dark lane in the stars or something .. didnt investigate it any further.
Just checked the night before image of M8 .. No such problem .. so it seems that last night was the beginning of it.
Jeff
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