Manual Celestron CGEM DX (page 8 of 38) (English)

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imbalance is very slight. When taking astrophotographs, this

balance process can be done for the speciﬁc area at which the

telescope is pointing to further optimize tracking accuracy.

balanCinG thE Mount in DEC

Although the telescope does not track in declination, the

telescope should also be balanced in this axis to prevent any

sudden motions when the DEC lock lever is loose. To balance

the telescope in DEC:

1. Loosen the R.A. clutch lock lever and rotate the telescope so

that it is on one side of the mount (i.e., as described in the

previous section on “Balancing the Mount in R.A.”).

2. Tighten the R.A. lock lever to hold the telescope in place.

3. Loosen the DEC clutch lock lever and rotate the telescope

until the tube is parallel to the ground.

4. Release the tube — GRADUALLY — to see which way it

rotates around the declination axis. DONOTLETGOOF

THE TELESCOPE TUBE COMPLETELY!

5. Slightly loosen the knobs that holds the telescope to the

mounting platform and slide the telescope either forward

or backward until it remains stationary when the DEC clutch

is loose. Do NOT let go of the telescope tube while the

knob on the mounting platform is loose. It may be necessary

to rotate the telescope so that the counterweight bar is

pointing down before loosening the mounting

platform screw.

6. Tighten the knobs on the telescope mounting platform to

hold the telescope in place.

Like R.A. balance, these are general balance instructions

and will reduce undue stress on the mount. When taking

astrophotographs, this balance process should be done for the

speciﬁc area at which the telescope is pointing.

aDjuStinG thE Mount

In order for a motor drive to track accurately, the telescope’s

axis of rotation must be parallel to the Earth’s axis of rotation, a

process known as polar alignment. Polar alignment is achieved

NOT by moving the telescope in R.A. or DEC, but by adjusting

the mount vertically, which is called altitude, and horizontally,

which is called azimuth. This section simply covers the correct

movement of the telescope during the polar alignment process.

The actual process of polar alignment, that is making the

telescope’s axis of rotation parallel to the Earth’s, is described

later in this manual in the section on “Polar Alignment

.”

Adjusting the Mount in Altitude

• Toincrease(raise) the latitude of the polar axis, turn the

rear latitude adjustment knob and loosen the front screw

(if necessary)

• Todecrease(lower) the latitude of the polar axis, turn the

rear latitude adjustment knob and tighten the front screw

(if necessary)

The latitude adjustment on the mount has a range from

approximately 15° to 70°.

It is best to always make ﬁnal adjustments in latitude by moving

the mount against gravity (i.e. using the rear latitude adjustment

screw to raise the mount).

Adjusting the Mount in Azimuth

For rough adjustments in azimuth, simply pick up the telescope

and tripod and move it side to side until it is roughly pointing

towards north. For ﬁne adjustments in azimuth:

1. Turn the azimuth adjustment knobs located on either side of

the azimuth housing (see Fig 2-10). While standing behind

the telescope, the knobs are on the front of the mount.

•Turningtherightadjustmentknobclockwisemovesthemount

toward the right.

•Turningtheleftadjustmentknobclockwisemovesthemount

to the left.

Both screws push off of the peg on the tripod head, which

means you may have to loosen one screw while tightening the

other. The screw that holds the equatorial mount to the tripod

may have to be loosened slightly.

Keep in mind that adjusting the mount is done during the polar

alignment process only. Once polar aligned, the mount must

NOT be moved. Pointing the telescope is done by moving the

mount in right ascension and declination, as described earlier in

this manual.

poWErinG thE Mount

The telescope mount can be powered by the supplied car

battery adapter or optional 12v AC adapter. Use only adapters

supplied by Celestron. Using any other adapter may damage

the electronics or cause the telescope not to operate properly,

and will void your manufacturer’s warranty.

1. To power the telescope with the car battery adapter (or 12v

AC adapter), simply plug the round post into the 12v outlet

on the electronic panel and plug the other end into your

cars cigarette lighter outlet or portable power supply (see

Optional Accessories

2. Turn on the power to the telescope by ﬂipping the switch,

located on the electronics panel, to the “On” position.

Hand ConTrol

All Celestron computerized telescope come with a hand

control designed to give you instant access to all the functions

that your telescope has to offer. With automatic slewing to

over 40,000 objects, and common sense menu descriptions,

even a beginner can master its variety of features in just a few

observing sessions. Below is a brief description of the individual

components of the computerized hand controller:

1. LiquidCrystalDisplay(LCD)Window: Has a dual-line,

16 character display screen that is backlit for comfortable

viewing of telescope information and scrolling text.

Figure 2-10

Rear

Latitude

Adjustment

Knob

Front

Latitude

Adjustment

Screw

Azimuth

Adjustment

Knob

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Celestron CGEM DX Manual

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