Celestron 4 - page 33

While your NexStar telescope requires little maintenance,there are a few things to remember that will ensure your telescope

performsat its best.

Occasionally, dust and/or moisture may build up on the corrector plate of your telescope. Special care should be taken when

cleaningany 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. Sprayat an

angle to the lens for approximately two to four seconds. Then, usean op tical cleaning solution and white tissue paper to remove

anyremaining debris. Apply the solution to the tissue and then apply the tissue paper tothe lens. Low pressure strokes should

gofro mth e center of the corrector to the outer portion. Do NOT rub in circles!

You can use a commerciallymade lens cleaner or mix your own. A good cleaning solution is isopropyl alcohol mixedwith

distilledwater. The solution should be 60% isopropylalcohol and 40% distilled water. Or,liquid dish soap diluted with water (a

coupleof 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 o bserving session. Ifyou want

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

grounduntil the dew has evaporated.

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

telescopein a dust-free environment and point it down. Thiswill remove the moisture from the telescopetube.

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 covershould be placed o ver the opening when not in use. This will prevent contaminants from entering the optical

tube.

Internaladjustments and cleaning should be done only by the Celestron servicedepartment. If your telescopeis in need of

internalcleaning, please call the factory for a return authorizationnumber and price quote.