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Thanks Bojan, but don’t worry about it too much. I knew that it would not be easy to solve. Trigonometry was never my strong point; it is not used much in electronics. And what I learn at collage some forty years ago – it’s mostly forgot by now.
The frame size is about 27 X 35 arc minutes. In this image the error would not be so big as the star is close to the centre. But sometimes I find interesting doubles close to the edge of the frame.
I found this sort of measurements interesting because according to WDS catalogue, some double stars last measurement was done 100 years ago.
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