Celestron Compustar Instrukcja Obsługi Pobierz pdf (Strona 41)

Figure 19A (left) The author’s SBIG STL 11000M CCD camera with the adapter plug

(labeled RC-7) plugged into the camera’s autoguider output port. The female modular

jack for an RJ-11 cable can be seen on the opposite end of the adapter, between the two

metal set screws.

Figure 19B (right). The SBIG STL 11000M CCD camera with the RJ-11 modular jack

from the autoguider relay box plugged into the adapter on the CCD camera. The relay

box can be seen in the lower left, with the DB-9 output cable leaving the left side of the

image, heading to the central port on the Compustar computer module.

Why Autoguide?

Autoguiding has a definite advantage aside from liberating the astrophotographer from the

drudgery of guiding. Astrophotographers guide manually by pushing a button, often with a quick

jab, trying to quickly correct a small guiding error. They also make a best guess at how long to

push the button to correct the guiding error. The drive may slowly accelerate up to guiding speed

as it is first activated and may decelerate for a period of time after the button is released. The

drives of the RA and Dec axes may have different speeds and different reaction times that may

be difficult for the astrophotographer to keep straight. These factors result in over correcting or

under correcting guiding errors. Astrophotographers can become cold, uncomfortable and

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Celestron Compustar Instrukcja Obsługi Strona 41