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www.william-optics.com
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Crafting the Earth's Finest
Astronomical Instruments
Usage
The Zenithstar series is designed to work with SCT-thread Diagonals, for both
daytime and nighttime viewing, as an outstanding travel scope. We recommend
purchasing a WO 2" star diagonal to make the most of these little telescopes.
Some 1.25" diagonals may require an additional extender. William Optics markets
an optional 2" SCT extender/adapter, as shown in the connection instructions.
Because the Zenithstar 66 are well suited to viewing nebulae, clusters, large
galaxies and comets, we recommend the use of high quality wide-angle eyepieces.
The WO SWAN and UWAN series eyepieces are available in a variety of focal
lengths. Viewing the moon and planets is also impressive at magnifications of 120X
when seeing conditions permit.
To calculate the magnification of your telescope and eyepiece combination, divide
the telescope focal length in mm by the eyepiece focal length in mm.
Keep in mind that the atmosphere plays an important role in seeing conditions, and
only the best seeing conditions will support high power viewing. Additional power
under less than ideal seeing conditions will not result in an increase in viewable
details, and lower powered eyepieces should there be used under those conditions.
It's easiest to locate objects using low power eyepieces (20X magnification) and
then zoom in by switching to higher powered eyepieces. The largest field of view will
be seen using a12X low power-wide field of view eyepiece.
A stable tripod or mount is recommended for optimal viewing. This includes high
quality photography tripods, and German Equatorial mounts, which are designed for
astronomical use and include precise tracking of celestial objects. Optional accessories
from WO include mounting rings and plates, super high quality 2" Quartz star
diagonals which provide for superior viewing and high quality images.
The Zenithstar telescopes are suitable for large-field astrophotography; the Petzval
version features a very flat and well corrected field of view, the SD version has great
color correction at a fast speed of f/5.9, whereas the triplet version has an excellent
color correction. Please see our website for examples of photos taken with these
telescopes. The Accessories Chart on page 05 provides additional details on
photographic accessories for various CCD, digital and film cameras.
Never aim your telescope or finderscope at the Sun without proper Solar filters
installed on the front of the telescope. Doing so for even a moment may permanently
damage your vision. Proper Solar filters consist of a filters made by reputable
manufacturers, designed to fit tightly over the front of the dew shield. Solar eyepiece
filters are not considered safe, and should not be used. With proper front mounted
Solar filters, the telescope will not be harmed by viewing the Sun. Contact your
Authorized WO Dealer for further information on the brands, sizes, and prices of
proper solar filters.
Storage and Cleaning
We suggest placing all accessories inside an airtight container with desiccative
control. Secondly, remember to store the telescope in a non-humid environment,
never leave it in a hot heated environment. If not properly stored, it may
develop mildew growth and other preventable build up.
Be particularly careful after a night observation that the lens has no dew on it
before storing the telescope away.
In case the lens surface becomes dusty, smeared, or gets fingerprints or fungus
build-up on it, first of all, remove any surface particle by using an air blower,
then carefully proceed to wiping the lens gently with a lint-free proper soft cloth.
Use a lens liquid cleaner to get the best cleaning result. Make sure you change
your cloth to a new one from time to time.
The above-mentioned indications are not necessary if you carefully protect your
telescope.
The beautiful anodizine of your ZenithStar 66 is not easy to ruin. Nonetheless
take care of the exterior body tube by wiping it down with a slightly damp soft
cloth from time to time. Water should be enough to do the job. Please do not
use any organic solvent on your telescope, for example alcohol, benzene and
other hazardous chemical as this might ruin it.
1:10 means that for every ten full rotations of the small fine-focus knob the large
knob rotates once.
2.5 mm
Allen key
Focuser Tension
Adjustment Screw
Drawtube Lock
Thumb Screw
All WO telescopes, including ZenithStar, are now fitted with a smooth and precise
dual speed 1:10 focusing system.
Tension should be adjusted only when necessary by progressively tightening the
screw until you reach the desired tension.
The focuser drawtube tension can be adjusted using a 1.5mm Allen key on the screw
protruding from the black hollow ring.
Make sure that the black ring is always tight against the focuser.
