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A Barlow lens is used to increase the magnification
of each eyepiece. First insert the Barlow 3X lens in
the telescope’s eyepiece holder, then the eyepiece
itself. Secure the lens using thumbnail screws. The
total magnification will be 135X when a 20 mm
eyepiece (45X) and a 3X Barlow lens are used
together.
Some words of caution on magnification.
Although the theoretical power or magnification of
a telescope is virtually limitless, there are practical
limits, such as the earth's atmosphere. Every
telescope has a useful magnification limit of about
2X per millimeter of aperture. This comes to 140X
for the 900X70. Moderate magnifications are what
give the best views. It is better to view a small, but
bright and detailed image than a dim, unclear,
oversized image.
5. Maintenance
If you give your telescope reasonable care, it will
last a lifetime. Store it in a clean, dry, dust free
place, safe from rapid changes in temperature and
humidity. Do not store the telescope outdoors,
although storage in a garage or shed is OK. Small
components like eyepieces and other accessories
should be kept in a protective box or storage case.
Keep the caps on the front of the telescope and on
the focuser drawtube when not in use.
Your 900X70 telescope requires very little
mechanical maintenance. The optical tube is
aluminum and has a smooth painted finish that is
fairly scratch resistant. If a scratch does appear, it
will not harm the telescope.
Cleaning Lenses
Any quality optical lens cleaning tissue and optical
lens cleaning fluid specifically designed for
multi-coated optics can be used to clean the
objective lens and the exposed lenses of your
eyepieces. Never use regular glass cleaner or
cleaning fluid designed for eyeglasses.
Before cleaning with fluid and tissue, blow any
loose particles off the lens with a blower bulb or
compressed air. Then apply some cleaning fluid to
a tissue, never directly on the optics. Wipe the lens
gently in a circular motion, then remove any excess
fluid with a fresh lens tissue. Oily fingerprints and
smudges may be removed using this method. Use
caution— rubbing too hard may scratch the lens.
For the larger surface of the objective lens, clean
only a small area at a time, using a fresh lens tissue
on each area. Never reuse tissues.
Barlow lens