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Thanks Troy and Lee. The weather has turned cloudy here so next time I'm out I'll redo the graph and give some more info.
Since my first post I've had one imaging session that went reasonably well. The graph was fairly flat for most of the time, then it will have a spasm and go wild for a minute, then behave itself again.
There was no wind or any outside influence that would have caused it. I have heard that people have found grit in their SW mounts when they've re-greased them. I can only guess that mine may have a similar problem. It hasn't done that much work so I don't think it's wear and tear.
So I'm currently losing about 20% of my subs due to random guiding errors.
I read another thread here somewhere about guiding where it was suggested to change the graph to pixels. I will grab a screenshot of both.
Cheers
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