11
(Fig. 13)
The image erector provides 1.5X magnification, which means that the 20-mm eyepiece
will magnify objects from 45X to 68X when used in conjunction with the image erector.
CARE AND CLEANING OF OPTICS
Optical components of a telescope get dirty over time. Dirt or dust on a lens should be
removed with the utmost care. A considerable amount of dirt or dust would have to
accumulate on the optical surface before your view would be compromised.
1) Keeping dust caps on during storage and transport will reduce dust collection.
2) Condensation may collect on the optical surfaces when the telescope is not in use.
Remove the dust caps and allow the moisture to evaporate naturally. Point the
telescope downward to minimize the accumulation of airborne dust.
3) Once all moisture has evaporated, replace the dust caps.
4) Filtered, compressed air may be used to remove surface dust from lenses and
mirrors. Remove the dust cap and the dew shield. Once removed, point the can away
from the lens and gently expel some air and any condensation or dust that has
accumulated on the discharge tube. Spray the lens or mirror with short bursts of air to
carefully remove the dust particles. DO NOT HOLD THE TRIGGER OF THE
COMPRESSED AIR CAN FOR EXTENDED PERIODS BECAUSE PROPELLANT
FROM THE CAN MIGHT ESCAPE AND DAMAGE THE OPTICAL SURFACE.
If, after several attempts, you cannot remove the particles, take the telescope to an
optical professional for cleaning.
If you keep the dust caps on your telescope when it is not in use and avoid handling the
lenses or mirrors, only minimal optical maintenance of your telescope should be
required. Extensive cleaning is usually only necessary every few years.
