It seems that bad quality of the raspberry pi camera caused a lot of problem. the image quality is really poor, so the stars position which was calculated based on the image was really inaccurate. After applying some filters the result is much better.
The first image is the picture of a star from the camera.. The second is the same picture after median filter. The third image is after applying sharpening. The last one is after removing dark gray pixels.
After all these finding the center of the star is much more accurate.
The orange line shows the star position before these fixes were implemented. The blue line shows the star position after the fix. It seems that the line is more smooth than before. After applying 3 step moving average (red line) is smooth enough for guiding.
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| M27, 6x150 sec exp, ISO800, 150/750 newton |
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