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Astrel Instruments

AST-8300-A

Automatic calibration

Set time in seconds during which the drift along axes will be performed, making sure it is

long enough that the star moves but always remains in the field. Use 'Find' to let the

software automatically choose a suitable star in the field or grab the green square and

drag it over the guiding star you prefer. Make sure that the square follows the star. Press

the button 'Start'. The program will start to shift the star along one or two axes afterwards.

The result will be shown at the end of calibration. 'Status: DONE' will be shown in the case

of successful termination and the axes of reference will take the new position. In case of

an error, the window with an error message will be shown. If the polar axis is poorly

aligned, the automatic calibration may be terminated with an error. In this case, it is not

recommended to perform the photographic surveying. Try to align the polar axis more

precisely.

Manual calibration

If the automatic calibration doesn't suit for any reason or terminates with an error, you can

perform manual calibration. To do this, grab the green square by the mouse pointer and

drag it over the guiding star.p Make sure that the square follows the star. Press the button

'Start'. Next use the mount control panel to shift the star position in RA+ direction and

press 'Stop'. If the two-axes mode is engaged, use the control panel to shift the star in the

DEC+ direction and press 'Stop' right after the end of the drift along RA. It is important to

understand that the longer the shift vector is, the more precise the determination of the

celestial coordinates' axes will be.

!!! WARNING !!!

It is recommended, that the square, following the star, doesn't touch the image edges

during the calibration.

Autoguider Manual

9/14

rev A