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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 C5
during an observing session. If you want to continue observing, the dew must be
removed, either with a Celestron Lens Shade / Dew Cap or by pointing the
spotting scope at the ground until the dew has evaporated.
If moisture condenses on the inside of the corrector, place the spotting scope in a
dust-free environment and point it down. Remove the accessories from the rear
cell of the spotting scope to allow the moisture to evaporate from the optical tube.
To minimize the need to clean your spotting scope, 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 C5 is in need of internal cleaning, please call the factory for
a return authorization number.
Collimation
The optical performance of your telescope is directly related to its collimation, that is the
alignment of its optical system. Your telescope 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.
The three collimation screws are
located on the front of the secondary
mirror housing.
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