Bedienungsanleitung Celestron NexStar 5SE (Seite 37 von 54) (Englisch)

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While your NexStar 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 corrector plate 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 corrector plate, 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.

Occasionally, you may experience dew build-up on the corrector plate of your telescope during an observing session. If you want

to continue observing, the dew must be removed, either with a hair dryer (on low setting) or by pointing the telescope at the

ground until the dew has evaporated.

If moisture condenses on the inside of the corrector, remove the accessories from the rear cell of the telescope. Place the

telescope in a dust-free environment and point it down. This will remove the moisture from the telescope tube.

To minimize the need to clean your telescope, replace all lens covers once you have finished using it. Since the rear cell is NOT

sealed, the cover should be placed over the opening when not in use. This will prevent contaminants from entering the optical

tube.

Internal adjustments and cleaning should be done only by the Celestron repair department. If your telescope is in need of internal

cleaning, please call the factory for a return authorization number and price quote.

Collimation

Screws

Corrector

Plate

Figure 8-1

The three collimation screws are located on the

secondary mirror holder in the center of the corrector

plate.

The optical performance of your NexStar telescope is directly related

to its collimation, that is the alignment of its optical system. Your

NexStar 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 only optical

element that may need to be adjusted, or is possible, is the tilt 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 minimal

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.

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