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I'd still say its a winner Doug. It maybe the data registration process is the cause as you suggest. The Ha filter is going to give you tighter star profiles so it will be interesting to verify the result and compare with your previous images. It maybe the extender or coupling...may need to get crafty a shim it to get it square. Though I've never heard of anyone doing this before. I'm assuming it doesn't occur with the lens alone i.e. no extender.
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