Celestron NexStar 4SE Computerized Telescope NexStar 4 SE Manual - Page 37

Care and Cleaning of the Optics, Do NOT rub in circles - price

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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 dustfree 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 service department. If your telescope is in need of internal cleaning, please call the factory for a return authorization number and price quote. 37

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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 service department.
If your telescope is in need of internal cleaning,
please call the factory for a return authorization number and price quote.
37