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sounds frustrating Glen, can you post a pic so we can see how dim they turned out? 260 seconds sounds like you should pick something up at f8, what iso? did you push the star detection threshold down to a lower percentage in DSS?
i'm currently investigating a 2x barlow for my f4 newt. If it can give a sharp and corrected image then it will be like having a long FL scope like a RC and a wider field instrument at half the price of the RC.
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