William Optics Megrez 80 - Manual (Page 7)

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www.william-optics.com
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Crafting the Earth's Finest
Astronomical Instruments
Usage
The Megrez 80 is designed to work with both 1 1/4" and 2" diameter eyepieces in
various focal lengths, for both daytime and nighttime viewing. Because the Megrez
80 is 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 130X 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. For example,
a 4mm eyepiece in a 480mm Megrez Fluorite will display an image of 120X.
(480mm / 4mm = 120) The suggested maximum magnification depends on the
model of scope as well, with the Megrez Fluorite able to handle the most power and
remain color free. Some C.A. (Chromatic Aberration) may be introduced by the
eyepiece or other accessories, so high quality eyepieces and accessories are
highly recommended to maximize the viewing ability of the telescope.
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.
Its 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 a 12X 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, and 2" Erecting Prisms, all of which provide for superior
viewing and high quality images.
The Megrez telescope line has been specifically designed for astrophotography,
with the Fluorite models best suited to the high quality imaging. Please see our
website for examples of photos taken with these telescopes. The Megrez Accessories
Chart on page 13 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 recommend storing all equipment in an air tight container with desiccate
packages to remove unwanted humidity from the air. Never leave the telescope in
a humid environment, and avoid leaving the scope in a hot heated environment. If
not properly stored, it is possible for the scope to develop mildew growth or other
preventable conditions. Be careful after a night of observing when conditions might
leave dew on the lens, and allow the scope to air dry in a room temperature
environment before storing the telescope.
If the front lens surface becomes dusty, smeared, shows fingerprints, or any other
surface build up, the following steps can be taken to clean the lens. First, gently
blow away any surface dust or particles with a clean air blower (canned or compressed
air is not recommended). Second, use a photographic quality optical cleaning
solution and cloths to gently wipe the surface clean. A clean cloth should be used
every time that cleaning is needed. With proper care, and protection, cleaning
should rarely be needed.
The Megrez is coated in a durable and beautiful multi-layer Dupont white paint finish
is tough and resistant to most natural elements but care should be taken to keep it
clean. A slightly dampened clean soft cloth with plain water should be enough to
clean the surface. Please avoid any harsh chemical cleaners or organic solvents
like benzene, alcohol, etc, as these may ruin the paint.
The focuser's tension can be adjusted using a 2.5mm allen wrench if needed.
The Focuser Lock Thumb Screw is used to tighten down the focuser's travel while
in use to prevent the focuser from accidentally moving. This is most likely when the
telescope is pointed upwards and the additional weight of large eyepieces or
photography equipment may make the focuser move on its own.
Please consult with your consult with your Authorized WO Dealer or WO directly if
you have any questions before adjusting the focuser.
2.5mm
Allen screw driver
Focuser Tension
Adjustment Screw
Focuser Lock
Thumb Screw