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Figure 6. Reinstall the screws, nuts, and focuser
Figure 7. Finished assembly in guide rings
4.
Reattach the screws and nuts to the open holes so that
no dust gets inside the tube and tighten with a screwdriver
(Figure 6), then reinstall the focuser, making sure the focus
knobs are back in the same orientation.
Figure 7 shows the reassembled optical tube sitting in the
5.
guide ring setup.
Care & Maintenance
Give your telescope reasonable care and it will last a lifetime. When
not in use, keep its dust cover on as well as the small plastic plug
on the focuser drawtube. Store it indoors or in a dry garage. Do
not leave the telescope outside except when using it. If a scratch
appears on the tube, it will not harm the telescope. Smudges on the
tube can be wiped off with standard household cleaners.
Dew
When you are ready to pack up your telescope at the end of the
night, avoid immediately storing it if you encountered heavy dew
and the telescope is damp. Instead, bring the telescope inside and
allow the moisture on the telescope to evaporate. If dew forms on
the objective lens, then leave the dust cover off of the telescope
until all the moisture has evaporated. Once the telescope has com-
pletely dried out, place it back in its case.
Cleaning Optical Surfaces
In general, your telescope will only need to be cleaned on a very
minimal basis. Dust particles on the objective lens do not affect the
optical quality of your refractor. Loose dust can simply be blown
off with air, using a compressed air can or photographer's blow-
er bulb. Any remaining dust is best left alone, unless the build up
is extreme. Fingerprints and water marks should be cleaned from
your telescope's objective lens. Any quality optical lens tissue and
cleaning fluid specifically designed for multi-coated optics can be
used to clean the telescope's objective lens as well as the lenses of
your eyepieces and finder scope. Never use regular glass cleaner,
or cleaning fluid designed for eyeglasses.
Before cleaning with fluid and tissue, however, blow any loose par-
ticles off the lens with a blower bulb or compressed air, or lightly
brush the lens with a soft camel hair brush. 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! Clean
only a small area at a time, using a fresh lens tissue on each area.
Never reuse tissues.
Specifications
Optical tube:
Optics design:
Lens glass:
Aperture:
Focal length:
F-ratio:
Lens coatings:
Tube baffle:
Tube length:
Dew shield outer diameter:
Weight:
Focuser:
Drawtube travel:
Focus lock:
Mounting bar:
Seamless luminum
Achromatic (doublet)
Crown and flint
80mm
400mm
5.0
Fully coated (all air-to-glass
surfaces MgF2 coated)
Yes
14-3/4" / 377mm
4-1/8" / 105mm
2 lbs. 4 oz. / 0.94 kg
25" rack and pinion
2-7/8" / 74mm
Yes
Aluminum, Vixen style, 3-1/8"
length
3
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