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Thanks everyone I really appreciate your help.
Step size was out..focal length was wrong how that happened I have no idea..anyways playing with it whilst capturing was causing dropped frames so I will finish my run and try again...I need to move the scope as suggested for a start as my object is not in the right place for calibration.
On the positive I have stars on the screen..It was not working earlier due to a corrupted dark file and man it took ages to find it, but after I deleted that file the camera worked and it at least went thru calibration routine...I feel it will work when I try it with correct focal length, this was set last time out but why I entered a fl double reality is beyond me...damn cold ..it's down to 4 C ...not far off I feel...I will finish my run at 12 and have another go if I don't freeze to death.
Thanks again.
Alex
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