Celestron Compustar Instrukcja Obsługi Pobierz pdf (Strona 42)

fatigued. The author has manually guided astrophotographs for long periods of time with no

errors, only to make a single error pushing the wrong button just once, near the end of the

exposure. This ruins the image by adding a small trailed blip to every bright star on the image.

None of these issues are problems with autoguiding. Autoguiding is calibrated so that the

computer knows precisely how much to move each axis to correct guiding errors, putting the

guide star back exactly where it needs to be and does so with sub-pixel accuracy. The autoguider

will not fatigue and it will not become uncomfortable. In fact, the autoguider camera will easily

remain in that uncomfortable position looking up into an off-axis guider from beneath the

telescope (Figure 3) as long as required (Figure 20).

Autoguiding is not the solution to all guiding problems. The telescope mount should have a

good, if not excellent, polar alignment. The mount should be as rigid as possible, with all

connections tightened. If using a separate guide telescope, its mounting on the Compustar should

be as rigid as possible within reasonable weight limits. The drive motors should be in good

condition and as free of backlash as possible. The telescope should be properly balanced.

Figure 20. The Meade DSI serving as an autoguider camera in an off-axis guider in the

same awkward, uncomfortable position shown in Figure 3. The autoguider can perform

competently and tirelessly in this position, as long as required.

The Author’s Experience With The Compustar Autoguider

The imaging results that can be obtained with autoguiding the Compustar can be gratifying,

indeed. Formerly, the author did all his imaging using a Canon 20D DSLR (which provides one

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