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Thanks Leon & Eric. This is the full FOV of the DSI II with my 10" f5 so no cropping done. I'd like a wider field - have my eyes on an ED80 for Christmas (or maybe sooner).
I've just started experimenting with longer exposures on the DSI having started at 5 seconds I'm now up to 15 but without autoguiding or good polar alignment I was getting deformed stars on the longer exposures.
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