Celestron Advanced VX 12031 Bedienerhandbuch PDF herunterladen (Seite 29)

I 29

Aligning the Finderscope

The ﬁnderscope is adjusted using two adjustment screws,

located on the top and on the right (when looking though the

ﬁnder) of the ﬁnder bracket and a spring-loaded pivot screw

(located on the left side of the bracket). This allows you to

turn the top adjustment screw to move the ﬁnderscope up

and down, and turn the right adjustment screw to move

the ﬁnderscope right to left. The spring-loaded pivot screw

puts constant pressure on the ﬁnder so that the adjustment

screws are always making contact with the ﬁnder.

To make the alignment process a little easier, you should

perform this task in the daytime when it is easier to locate

objects in the telescope without the ﬁnder. To align the ﬁnder:

1. Choose a conspicuous object that is in excess of one

mile away. This will eliminate any possible parallax effect

between the telescope and the ﬁnder.

2. Point your telescope at the object you selected and

center it in the main optics of the telescope.

3. Lock the azimuth and altitude clamps to hold the

telescope in place.

4. Check the ﬁnder to see where the object is located

in the ﬁeld of view.

5. Adjust the thumb screws on the ﬁnder bracket until

the cross hairs are centered on the target.

Removing the Lens Cap

The EdgeHD and Schmidt-Cassegrain telescopes utilize a

lens cap with a bayonet-type locking mechanism to hold it

in place. To remove the lens cap, hold the cover ﬁrmly and

rotate the outer edge 1/2” counterclockwise and pull off.

Polar Aligning the Mount

Latitude Scales

The easiest way to polar align a telescope is with a latitude

scale. Unlike other methods that require you to ﬁnd the

celestial pole by identifying certain stars near it, this method

works off of a known constant to determine how high the

polar axis should be pointed. The Advanced VX mount can

be adjusted from 7 to 77 degrees.

The constant, mentioned above, is a relationship between

your latitude and the angular distance the celestial pole

is above the northern (or southern) horizon; the angular

distance from the northern horizon to the north celestial pole

is always equal to your latitude. To illustrate this, imagine that

you are standing on the North Pole, latitude +90°. The north

celestial pole, which has a declination of +90°, would be

directly overhead (i.e., 90° above the horizon). Now, let’s say

that you move one degree south — your latitude is now +89°

and the celestial pole is no longer directly overhead. It has

moved one degree closer toward the northern horizon.

This means the pole is now 89° above the northern horizon.

If you move one degree further south, the same thing happens

again. You would have to travel 70 miles north or south to

change your latitude by one degree. As you can see from

this example, the distance from the northern horizon to the

celestial pole is always equal to your latitude.

If you are observing from Los Angeles, which has latitude

of 34°, then the celestial pole is 34° above the northern

horizon. All a latitude scale does then is to point the polar

axis of the telescope at the right elevation above the northern

(or southern) horizon. To align your telescope:

1. Make sure the polar axis of the mount is pointing due

north. Use a landmark that you know faces north.

2. Level the tripod. There is a bubble level built into the

mount for this purpose.

3. Adjust the mount in altitude until the latitude indicator

points to your latitude. Moving the mount affects the

angle the polar axis is pointing. For speciﬁc information

on adjusting the equatorial mount, please see the section

“Adjusting the Mount.”

This method can be done in daylight, thus eliminating the

need to attempt in the dark. Although this method does

NOT put you directly on the pole, it will limit the number of

corrections you will make when tracking an object. It will also

be accurate enough for short exposure prime focus planetary

imaging (a couple of seconds) and short exposure piggyback

astroimaging (a couple of minutes).

Polar Align using the Hand Control

The Advanced VX mount has a polar alignment function

called “All-Star” Polar Alignment that will help you polar

align your telescope for increased tracking precision and

for astroimaging. This feature allows you to choose any

bright alignment star to assist in accurately aligning your

telescope’s mount with the North Celestial Pole. Before

using the Polar Align feature, the scope must ﬁrst be roughly

pointed towards north and should be aligned with three

stars in the sky. See the “Latitude Scale” section for help

with ﬁnding north and adjusting the mounts latitude.

Once your telescope is aligned on two stars and at least

one additional calibration star, slew the telescope to any

bright star in its Named Star database list. For best results,

choose a polar alignment star that is high in the sky and near

the Meridian. Try to avoid stars that are close to the west/

east horizon, directly overhead or too near the celestial pole.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 35 36

Kommentare zu diesen Handbüchern

Keine Kommentare

Celestron Advanced VX 12031 Bedienerhandbuch Seite 29

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Teleskope Celestron Advanced VX 12031