Celestron Polar Axis Finderscope Manual

Celestron Ikke kategoriseret Polar Axis Finderscope

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Side 1/2

2835 Columbia Street, Torrance, CA 90503 • Phone (310) 328-9560 • Fax (310) 212-5835

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 objects as they move across the sky and accurately use your 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 nder into 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 it needs 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

platform is 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

2835 Columbia Street, Torrance, CA 90503 • Phone (310) 328-9560 • Fax (310) 212-5835

Figure 3

4. Determine how far and in what direction the optical axis moved from the mechanical axis.

5. Use the three adjustment screws (See gure 1) on the polar scope to move the nder’s optical axis (cross hairs) toward

the point where the mechanical axis is pointing. Keep in mind that the image in the nder is inverted. It may take a

few minutes to familiarize yourself with the screws that move the nder in the appropriate direction.

6. Repeat this process until the optical axis of the nder is centered on the rotational axis of the mount.

When nished, tilt the mount head to your correct latitude and re-install the optical tube and counterweight bar and follow

the procedure for rough polar alignment in your telescope instruction manual.

Using the Polar Finder

Northern Hemisphere

1. Identify the Big Dipper pattern in the constellation Ursa

Major, or nd the constellation Cassiopeia in the night

sky. In spring and summer, the Big Dipper will be higher

in the sky and easier to nd. In fall and winter,

Cassiopeia may be easier to use.

2. The patterns for both are etched on your polar scope

reticle (Fig.3). Simply rotate your mount in RA until one

of the patterns matches its actual orientation in the sky.

Lock the RA axis. Now the small circle on the perimeter

of the larger circle is in the correct position for locating

Polaris.

3. Next, use your azimuth and altitude adjustment controls

to place Polaris inside the small circle. Tighten your

azimuth and altitude knobs, then tighten your locking

shaft bolt to secure the mount to the tripod and you are

done.

Southern Hemisphere

There is a 4-star pattern in the polar scope that corresponds to four stars in the southern constellation Octans. You

can use these stars to align your mount to the south celestial pole. Identify the pattern in the sky and point your

telescope mount towards it. Once you can see all four stars in the eld of your polar scope, simply rotate your

mount in RA and adjust your altitude and azimuth positions until the stars line up with their positions on the

reticle.

Warranty: Two year limited warranty. See the Celestron Accessory Catalog (#93685) for complete warranty details or contact Celestron

#94223

INST

Produkt Specifikationer

Mærke:	Celestron
Kategori:	Ikke kategoriseret
Model:	Polar Axis Finderscope

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