Celestron Polar Axis Finderscope Handleiding

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Figure 2

Polar Axis Finderscope- CG-4 & CG-5 -#94223/94224

The Celestron Polar Axis Finder is designed to help you polar align your CG-4(Omni Series)or CG-5(Advanced Series)

Equatorial Mount quickly, easily and with a high degree of accuracy. As a result, you can spend more time observing and

less time setting up.

Polar alignment is the process of aligning the telescope with the Earth’s rotational axis. Once done, this will allow you to

track celestial objectsas they move across the sky and accurately useyour telescopes Setting Circles (CG-4 Mount). The

Celestial Coordinate System, Motion of the Stars, Using Setting Circles,are described in the telescope instruction manual.

For those using a telescope in the northern hemisphere, polar alignment is relatively easy due to the fact that the North

Celestial Pole (NCP) has a bright star close to it (Polaris) that’s easy to nd.

Installing the Polar Axis Finder

1.Remove the nderscope housing on the rear of the telescope’s polar housing.

2.Insert the Polarnderinto the telescope housing and thread clockwise until

tight.

3.Remove the cap from the front of the polar housing a rotate the declination

axis until you can see through the polar housing without obstruction. (for

CG-5 mounts only)

Aligning the Optical Axis

Before the polar nder can be used itneeds to be aligned with the polar axis of

your telescope’s mount. Note, you can do this procedure at night while pointing at Polaris. However, it is probably easier to

do it in the daytime using a distant point as your target (e.g, a street light a couple of hundred yards away). Before

calibrating the optical axis, remove the telescope, the counterweights and the counterweight bar from the mount. Next,

using the altitude adjustment bolts, incline the

polar axis until it is level to the ground.

To align the optical axis of the nder:

1.Release the R.A. clamp and rotate the

mount until the platform where the

telescope sits is o to the right of the

mount.

2.Find an object in excess of one mile away

and center it on the cross hairs.

3.Now, release the R.A. clamp again and

rotate the mount so that the telescope

platformis on the left side of the mount.

The object originally seen at the

intersection of the cross hairs will, most

likely, have moved o-center(See gure

2).The point where the cross hairs

intersect (center of the optical axis) will

scribe a semi-circle around the point

where the mechanical axis is pointing.

Figure 1

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