Thanks James and Paul for your comments. James - I will look into your suggestion. My lpf is of the clip in variety and it could be the culprit.
Paul - although it looks not to be my problem I have saved your beautifully prepared instructions about tube flocking for possible future use. I really need to get on with some proper imaging. I hope to image the Flame nebula which is close to the bright star Alnitak. This should be a good test of my possible bright star problem. Cheers Peter
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