Handleiding Celestron CPC Deluxe 800 HD - 11007 (pagina 32 van 50) (Engels)

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The optical performance of your CPC telescope is directly related to its

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

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

power ocular – 1 mm to 6 mm focal length. It is important to center a

star in the center of the eld to judge collimation. 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 re-collimation is needed.

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While your CPC telescope requires little maintenance, there are a few

things to remember that will ensure your telescope performs at its best.

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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 nished 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.

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