Now we know whether the images captured by our telescope-camera are or not reversed. And the option 'Reversed image' is or is not checked as needed.
We also have stars selected in our images. If not go back to the previous pages.
Here we are going to compute our calibration parameters.
Go to the File menu, then to A- Image path... and select your image.
The image is loaded. Go to the Search Field menu, select '- 5x5 degrees field with fixed image angle'.
Now press the Analyze button.
A red circle is drawn around the strongest selected stars.
If you have less than two selected stars, go to the "How to have selected stars in my images " help page, then proceed with the step bellow.
Now with the help of a planetarium, you must recognize some stars from your image.
Choose two of them, not too near one from the other. They are the calibration stars.
Copy from the planetarium the catalog number of these two stars.
In our example we are going to use the stars GSC-2531-1730 and GSC-2531-2027 (numbers 8 and 7 in the image)
Now place the mouse arrow near the selected star number 8 (in our example) then right click and then select the 'Star A to calibrate'.
A cross will be drawn on the star.
Right click on the selected star number 7 and select 'Star B to calibrate'.
Go to the 'Others' menu and click on 'Calibrate the pixel size and image angle'.
The calibration window is shown.
Introduce the two catalog star numbers as shown.
Press the 'Compute' button ( DON'T FORGET ) (former 'Calibrate' button)
The computed calibration parameters are shown in the yellow boxes.
Click the 'Apply' button to accept the new calibration.