Telescope Maintenance; Care And Cleaning Of The Optics - Celestron Astromaster 90 AZ Mode D'emploi

TELESCOPE MAINTENANCE

While your 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 objective lens or primary mirror depending on which type of
telescope you have . 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 glass surface 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 optics . Low pressure
strokes should go from the center of the lens (or mirror) 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 optics 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 optics, remove the accessories from 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 cells are
NOT sealed, the covers should be placed over the openings 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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