Meade Image Processing Manual de usuario descargar pdf (Pagina 19)

(iii) The ST10 camera comes with two built-in chips.

The large imaging chip is used to take pictures,

and the little tracking CCD (also called guide

chip), located above the large one as shown in

Fig. 11, is used for guiding. They work

simultaneously, and you can take many tracking

images during a long imaging exposure. When the

guiding software is activated, the camera uses a

little chip to take images of a guide star a few

times a second. When the guide star moves out of

its original position (due to inaccuracies in the

tracking), the mount is adjusted to shift the image

back to its original position. Without guiding, the

image will noticeably move already during a

short, 1-2 min exposure! Any reasonable picture

taking needs guiding.

(iv) The camera has additional cold-water cooling,

which can be used when air temperature is

over 50 F. Ice cubes are used to cool off water,

which is then pumped through the camera.

● The imaging software

The camera, the filter wheel, and the guide chip are controlled by

the CCDOPS software installed on the computer.

Many of CCDOPS’s controls are self-explanatory, but some of them

need comment:

(i) Setup: the cooler should be set at about 30

C below air

temperature. For the cooler to keep the temperature reliably, it

should not run at more than ~80% power. Unless there is reason

to change this, use “high resolution” for the imaging CCD,

which should be the active CCD, “automatic resolution” for the

tracking CCD. Before shutting down, always switch the cooler

first and wait for its power to go down to 0%.

(ii) Focusing: this utility does not really do focusing but simply keeps taking images,

without saving them. Use “planet mode” for focusing.

(iii) Dual CCD view: this utility keeps taking images with both chips simultaneously.

Use it to aim the telescope at your object, and to pick a sufficiently bright guide star on

the tracking CCD.

Fig. 11: The imaging chip and the

guiding chip work simultaneously

Fig. 12: The focuser is

hand-controlled

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Meade Image Processing Manual de usuario Pagina 19