Bedienungsanleitung Celestron SkyProdigy 6 - 11076 (Seite 23 von 32) (Englisch)

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TELESCOPE MAINTENANCE

While your SkyProdigy telescope requires little maintenance,

there are a few things to remember that will ensure your telescope

performs at its best.

Care and Cleaning of the Optics

Occasionally, dust and/or moisture may build up on the lens of

your telescope. Special care should be taken when cleaning any

instrument so as not to damage the optics.

If dust has built up on the optics, remove it with a brush (made

of camel’s hair) or a can of pressurized air. Spray at an angle to

the lens for approximately two to four seconds. Then, use an

optical cleaning solution and white tissue paper to remove

any remaining debris. Apply the solution to the tissue and then

apply the tissue paper to the lens. Low pressure strokes should

go from the center of the corrector to the outer portion. Do NOT

rub in circles!

You can use a commercially made lens cleaner or mix your own.

A good cleaning solution is isopropyl alcohol mixed with distilled

water. The solution should be 60% isopropyl alcohol and 40%

distilled water. Or, liquid dish soap diluted with water (a couple

of drops per one quart of water) can be used.

To minimize the need to clean your telescope, replace all

lens covers once you have finished using it. This will prevent

contaminants from entering the optical tube.

Collimation (For SkyProdigy 6)

The optical performance of your SkyProdigy telescope is directly

related to its collimation, that is the alignment of its optical

system. Your SkyProdigy was collimated at the factory after it

was completely assembled. However, if the telescope is dropped

or jarred severely during transport, it may have to be collimated.

The SkyProdigy 102 has xed optical systems that should not

come out of collimation. The SkyProdigy 6, however has three

collimation screws that can be used to adjust the alignment of the

secondary mirror.

To check the collimation of your telescope you will need a light

source. A bright star near the zenith is ideal since there is a mini-

mal amount of atmospheric distortion. Make sure that tracking

is on so that you won’t have to manually track the star. Or, if you

do not want to power up your telescope, you can use Polaris. Its

position relative to the celestial pole means that it moves very

little thus eliminating the need to manually track it.

Before you begin the collimation process, be sure that your

telescope is in thermal equilibrium with the surroundings. Allow

45 minutes for the telescope to reach equilibrium if you move it

between large temperature extremes.

To verify collimation, view a star near the zenith. Use a medium

to high power ocular - 12mm to 6mm focal length. It is impor-

tant to center a star in the center of the eld to judge collima-

tion. Slowly cross in and out of focus and judge the symmetry

of the star. If you see a systematic skewing of the star to one

side, then recollimation is needed.

NOTE: Once your SkyProdigy 6 has been collimated, the

optics may no longer be aligned with the optical axis of the

camera resulting in unsuccessful alignments or poor pointing

accuracy. Therefore, it is recommended that you calibrate

the camera after collimation. For information on calibrating

the camera, see the Calibrate option under the StarSense

Camera section of the manual.

To accomplish this, you need to tighten the secondary collima-

tion screw(s) that move the star across the eld toward the

direction of the skewed light. These screws are located in the

secondary mirror holder (see gure 6-1). Make only small 1/6

to 1/8 adjustments to the collimation screws and re-center the

star by moving the scope before making any improvements or

before making further adjustments.

To make collimation a simple procedure, follow these easy steps:

1. While looking through a medium to high power eyepiece,

de-focus a bright star until a ring pattern with a dark shadow

appears (see gure 6-3). Center the de-focused star and notice in

which direction the central shadow is skewed.

2. Place your nger along the edge of the front cell of the

telescope (be careful not to touch the corrector plate), point-

ing towards the collimation screws. The shadow of your nger

should be visible when looking into the eyepiece. Rotate your

nger around the tube edge until its shadow is seen closest to

the narrowest portion of the rings (i.e. the same direction in

which the central shadow is skewed).

3. Locate the collimation screw closest to where your nger is

positioned. This will be the collimation screw you will need to

adjust rst. (If your nger is positioned exactly between two of

the collimation screws, then you will need to adjust the screw

opposite where your nger is located).

FIGURE 6-2

Even though the star pattern appears the same on both sides of focus,

they are asymmetric. The dark obstruction is skewed o to the left side

of the diraction pattern indicating poor collimation.

INSTRUCTION MANUAL

FIGURE 6-1

Collimation Adjustment Screws

Collimation

Screws

Corrector

Plate

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