47
Note: For ETX 90/125 users:
When cleaning the
inside surface of the correcting lens, leave the lens
mounted in its metal cell throughout the process. Do
not remove the lens from its metal housing or optical
alignment of the lens will be lost.
5.
If your ETX model is used outdoors on a humid
night, telescope surfaces may accumulate water
condensation. While such condensation does not
normally cause any damage to the telescope, it is
recommended that the entire telescope be wiped
down with a dry cloth before being packed away. Do
not, however, wipe any of the optical surfaces. Rather,
simply allow the telescope to sit for some time in warm
indoor air, so that the wet optical surfaces can dry
unattended. In addition, the dust cap should not be
placed back on to the optical tube until the telescope
is thoroughly dry.
6.
If your ETX model is not to be used for an extended
period, perhaps for one month or more, it is advisable
to remove the eight AA-size batteries from inside
the drive base. Batteries left installed for prolonged
periods may leak, causing damage to the telescope’s
electronic circuitry (see Assembling the tripod, page 5).
7.
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optical tube may fade if left in direct sunlight for
prolonged periods.
8.
Do not leave your ETX model outdoors on a warm
day or inside a sealed car for an extended period of
time; excessive ambient temperatures can damage the
telescope’s internal lubrication and electronic circuitry.
Storage and Transport
When the telescope is not in use, store it in a cool,
dry place. Do not expose the instrument to excessive
heat or moisture. It is best to store the telescope in
its original box with the vertical and horizontal locks
(Pg. 14 , Fig. 5, 10 and and Pg. 15, Fig. 8, 18) in the
unlocked positions. If shipping the telescope, use
the original box and packing material to protect the
telescope during shipment.
MAINTENANCE
Your ETX model telescope is a precision optical
instrument designed to yield a lifetime of rewarding
observations. Given the care and respect due any
precision instrument, the telescope will rarely require
factory servicing or maintenance. Use the following
guidelines:
1.
Avoid cleaning the telescope’s optics: a little dust
on the front surface of the telescope’s correcting lens
causes virtually no degradation of image quality and
should not be considered reason to clean the lens.
2.
When absolutely necessary, remove dust from the
front lens with gentle strokes of a camel-hair brush
or blow it off with an ear syringe (available at any
pharmacy). Do not use a commercial photographic
lens cleaner.
3.
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from the front lens with a solution of 3 parts distilled
water to 1 part isopropyl alcohol. A single drop of
biodegradable dish washing soap may be added per
pint of solution. Use soft, white facial tissues and make
short, gentle strokes. Change tissues often.
Caution:
Do not use scented, colored or lotioned
tissues or damage could result to the optics.
4.
In the very rare situation where cleaning the inside
surface of the corrector lens becomes necessary, un-
thread the lens cell located at the front of the main
tube. The entire correcting lens and secondary mirror
system are mounted in this cell. You may use the lens-
cleaner solution described in step 3 to clean the inside
surface of the lens.
Caution: For ETX 90/125 users:
Do not touch the
aluminized circular surface of the secondary mirror
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almost certainly scratch the mirror surface.
MAINTENANCE
