William Optics ZenithStar 80 User manual

ZENITHSTAR 80
INSTRUCTION MANUAL
www.william-optics.com
William Optics Corp.
Fluorite Doublet
WILLIAM OPTICS USA
Crafting the Earth's Finest Astronmical Instruments
CONTACT US
WILLIAM OPTICS USA
Toll Free: [phone] (For USA only)
Tel: [phone]
Fax: [phone]
web: www.william-optics.com
e-mail: [email protected]
Crafting the Earth's Finest Astronmical Instruments

CONTENTS
01
02
03
04
05
06
07
08
09
10
10
11
12-18
19-20
Please carefully familiarize yourself with your telescope's
parts and functions before operating it for the first time.
Crafting the Earth's Finest Astronmical Instruments
It could easily cause instant blindness or serious damage to your
eyes. To view the sun, use only appropriately designed solar filters
that will reject 99.96% of the sun light and heat. Educate your family
on how to use this telescope properly during day and night time
observations. For further information please contact your local dealer.
DO NOT USE THIS TELESCOPE UNDER ANY
CIRCUMSTANCES TO DIRECTLY VIEW THE SUN.
WARNING!
www.william-optics.com
Getting to know your telescope
Zenithstar Fluorite Doublet Specifications
Zenithstar Fluorite Doublet Acessories Chart
Connection Instructions ( 2 inches Diagonal Mirror )
Connection Instructions ( 2 inches 45 Erecting Prism )
Connection Instructions ( Red Dot Finder )
Connection Instructions ( Aligning R.D.F. )
Usage
Storage and Cleaning
Caution and Safety
Bundle Equipment
Optional Equipment
Recommended for This Scope
WO Policies & Warranty
Thank you for choosing a William Optics ZENITHSTAR
Fluorite Doublet, William Optics' 10-year anniversary
telescope.
This simple step-by-step instruction manual is designed to
provide Zenithstar Fluorite Doublet (ZSFD) owners with a
better understanding of how to operate their new telescope
by providing precise, updated information.
These instructions will also guide you through how to properly
maintain the Zenithstar, and how to operate it at its maximum
capabilities.

www.william-optics.com
Retractable dew shield
Dew shield cover
L-bracket
2" to 1.25" adapter
o
360 rotatable focuser knob
2" 360 Rotating Camera-Angle
Adjuster, 1:10 fine focus
Focuser Travel Length 80mm (3.15" )
1.25" Adapter & 2" extender Included
Getting to know your telescope
1.25" adapter lock screw
2" clamping screw
Main tube
Extend
Zenithstar Fluorite Doublet
Refractor Specifications
P01
Limiting Magnitude
Aperture
Focal Ratio
Focal Length
Objective Type
Resolving Power
Lens Shade
Focuser
1.25" Adapter
Field Stops
Tube Diameter
Tube Weight
Tube Length
Case
Case Dimensions
L-Type Mount
P02
80mm
F / 6.9
555 mm
Fluorite Doublet, Air Spaced, APO
TMB co-designed Fully Multi-Coated,
STM coating
1.45"
11.3
Retractable
Brass Compression Rings
15 Baffles
90mm
2.4 kg (5.3 lbs.)
375 mm (14.7") Fully Retracted
440 mm (17.3") Fully Extended
Aluminium Case (Standard)
48 x 28 x 16cm (19" x 11" x 6.3")
L Bracket Based
Lock screw for
the focuser tube
Connection point
for tripod
1:10 fine focus knob

Digital
Video
DCL-4337
Zenithstar Fluorite Doublet
Accessories Chart
Connection Instructions
( 2" Diagonal Mirror )
P03
www.william-optics.com
P04
Above diagram is only for future connectivity purposes.
Please contact our Authorized Dealers for accessories purchase.
Step-1
Using the supplied L-Bracket, attach the
telescope to the tripod threaded with a standard
photographic 1/4-20 connection knob. Ensure
that the knob is tight or locked down before
proceeding.
After the telescope is firmly connected to the
tripod, extend the dew shield.
Loosen lock screw for release. Remove 2" to 1.25" adapter.
Tighten lock screw.
Tighten lock screw.
Insert eyepiece for
visual observation.
Step-2
Step-3
Step-4
Crafting the Earth's Finest Astronmical Instruments
90mm
Mounting
Rings
Tripod
6x30 Erecting
Finderscope
Cooling CCD
Camera
SLR / DSLR
Camera
2" Photo
Adapter
2" Diagonal
Mirror 2" Eyepiece
Digital Camera
(Canon,CASIO,
SONY,OLYMPUS)
DCL-28
Violet
Reducer
Filter(VR)
NIKON
Digital
Camera
1.25"
Eyepiece
Aluminium Case
(Standard)
Equatorial Mount
Finder Bracket
(For 50mm)
7x50 Erecting
Finderscope
1.25" 45
Erecting
Prism
2" 45
Erecting Prism
1.25" 45
Erecting Prism
(2" Barrel)
Dovetail
Finder Bracket
(For 30mm)
DCL-52
1.25"
Adapter
1.25"
Adapter
EZTouch
Quick-Release
Bracket
Red Dot Finder(R.D.F.)
2" Extender

P05
www.william-optics.com
P06
Step-1
Tighten lock screw.
Tighten lock screw.
Insert eyepiece for
visual observation.
Step-2
Step-3
Step-4
Crafting the Earth's Finest Astronmical Instruments
Connection Instructions
( 2" Erecting Prism )
Using the supplied L-Bracket, attach the
telescope to the tripod threaded with a standard
photographic 1/4-20 connection knob. Ensure
that the knob is tight or locked down before
proceeding.
After the telescope is firmly connected to the
tripod, extend the dew shield.
Loosen lock screw for release. Remove 2" to 1.25" adapter.
Step-1
Take out the finderscope screw from
the drawtube top with a small flat
screwdriver. This is the larger black
screw at the left of the rotation lock
thumbscrew.
Step-3
Step-4
Connection Instructions
( Red Dot Finder )
R.D.F Base
Insert the quick release red-dot finder
bracket in the base.
Lock the bracket thumbscrew properly
and follow alignment instructions. Note
that this is an optional product available
for purchase from WO.
Base Lock Screw
Finderscope Screw
2.5mm
We suggest positioning the RDF base
with the thumbscrew facing towards
the left.
Step-2
R.D.F Base

Connection Instructions
( Aligning R.D.F. )
Step-2
Use a 2mm Allen key to loosen
the setscrew on the left side
of the RDF, near the bracket
under the letter "R". Using a
2.5 mm Allen key make
adjustments to the Alt-Az
adjustments (marked R and
UP) until the red dot in the
reticule overlays the same
object as the center of the
eyepiece view.
Step-3
Using a high magnification
eyepiece (short focal length)
repeat this procedure for fine
alignment.
Step-1
Find a distant object in the
telescope with a low power
eyepiece.
P07
www.william-optics.com
P08
Crafting the Earth's Finest Astronmical Instruments
Usage
The Zenithstar FD series is designed as the ultimate, versatile short tube refractor. It is
perfect for travel, piggybacking/guiding scope, astrophotography, rich-field observations.
We recommend purchasing a WO 2" star diagonal to make the most of this telescope.
Because the Zenithstar FD is well suited to viewing nebulae, clusters, large galaxies and
comets, we recommend the use of high quality wide-angle eyepieces. The WO UWAN
series eyepieces are available in a variety of focal lengths and make a perfect complement
to this telescope.
Viewing the moon and planets is also very 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 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 black anodized mounting rings and plates, super high quality 2" Quartz star
diagonals which provide for superior viewing and high quality images.
A recommended Alt-az. mount for this telescope is William Optics high-quality mount,
EazyTouch. This beautiful mount is easy to use and will provide a perfect, quick-to-set-
up addition to your collection.
The ZSFD is suitable for large-field astrophotography; the accessories Chart on page 03
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.
The alignment of the finder needs to be performed only when necessary. We
recommend aligning during daytime by point telescope and finder at the same
far object.
View Field of Telescope.
(with WO Dielectric)
Alignment Setcrews
View Field of Red Dot Finder.
(with WO Erecting Illuminated
Red Dot Finder)
Reticule Selector
Brightness Adjustment

Bundle Equipment
1. Practical aluminum carrying case, with custom-fitted foam,
water resistant and carry-on size.
2. L-bracket
3. 2" to 1.25" adapter
4. 2" extender (necessary to reach visual focus with most eyepieces,
but not necessary with WO binoviewers).
Storage and Cleaning
P09
www.william-optics.com
P10
Crafting the Earth's Finest Astronmical Instruments
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 Zenithstar has a beautiful high gloss anodized finish that can be easily smudged
with fingerprints; however this will not harm the finish. 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
finish.
Caution! Never directly view the Sun with your telescope!
Do not aim your telescope at the Sun without a front mounted high
quality professionally manufactured solar filter. Viewing the Sun without
the proper protection may result in permanent severe damage to your
eyes, and even cause blindness. Contact your Authorized WO Dealer
if you are interested in purchasing a compatible and proper solar filter.
Always place the telescope on a flat surface, to prevent it from falling
and injuring yourself or others.
Never use the telescope in the rain or in conditions where it may get
wet. The telescope is not designed to be waterproof. If the telescope
accidentally gets caught in the rain, immediately wipe off all water
using a clean dry soft cloth. If the telescope gets totally soaked in
water, immediately contact your Authorized WO Dealer for service
instructions.
Do not disassemble or attempt to repair your telescope without a
written authorization from William Optics Corp., as this violates the
warranty terms under the limited product warranty, and negates any
guarantee.
Caution for Safety
1:10 means that for every ten full rotations of the small fine-focus knob the large
knob rotates once.
2.5mm
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 2.5mm Allen key on the
screw protruding from the black hollow ring.
Make sure that the black ring is always tight against the focuser.

Recommended For This Scope
P11
www.william-optics.com
P12
Crafting the Earth's Finest Astronmical Instruments
Optional Equipment
Erecting, illuminated reticle finderscopes with bracket ( 6x30 and 7x50 models
available).
WO 2" and 1.25" Erecting prisms.
Super wide angle Eyepieces, 1.25" or 2" versions.
DCL 28, 4337 series.
(Digital Camera adapter Lens for Digital Cameras and Digital Video).
Digiscoping adapter: universal adapter for any type of digital camera.
WO 1.25" VR-1 filter improves seeing on bright objects like the Moon.
(Violet-Reducer).
WO 80 mm mounting rings, saddle plate, dovetail plate combo for equatorial
mounting.
WO 2" Extension Tube.
WO 2" Photographic Adapter
Also available from WO:
A sturdy tripod for astronomical or birding usage or a mount (equatorial or ALT-
AZ).
A mirror diagonal or erecting prism (The WO 2" Dielectric Diagonal is strongly
recommended for better results in star observation and digital photography. A top-
quality Dielectric Quartz model is also available now).
At least one or two good eyepieces (9 to 40 mm wide-field recommended)
depending on the application.
For ZenithStar Fluorite Doublet, a 2" extender already provided.
In order to operate your ZenithStar Fluorite Doublet you will need the
following minimum equipment:
For astrophotography, a photo adapter plus a T-mount connection are necessary.
William Optics offers a 0.8x reducer flattener with CCD camera adapter.
Please refer to our Accessories Chart on page 03.
Quality nebula filters, light pollution filters, Solar Max H-alpha filters, depending on
the application.
Diagonal Mirrors
High-quality dielectric coating (99% reflectivity),
precision-polished quartz flat in our much-admired,
patented mechanics.
Our 2" Diagonals are what you need for your best
observing sessions. Only from William Optics.
2" Quartz
Dielectric Diagonal
99% reflectivity with 1/10 lambda high-
precision mirror surface, with elegant
exterior design, with 1.25" adapter.
2" Dielectric
Diagonal Mirror
Binoviewer Package
Enjoy the pleasures of BaK4 quality binoviewers
with compressions rings in your refractor, SCT
or Newtonian with a value package including
2 eyepieces (1.25" WA 66 20mm ) and 1.6x
corrector Barlow!
Binoviewer

1.25" 45
Perfect both for astronomical and terrestrial observations.
Revolutionary and sophisticated design, extra-smooth feel.
45 Erecting Prisms
90 Erecting Prism
P13
www.william-optics.com
P14
Crafting the Earth's Finest Astronmical Instruments
Digital Camera adapter Lenses
This innovative digital adapter lens is designed for large-lens digital
camera and digital video cams users' needs.
It can be connected to any 2" diagonal or erecting prism.
DCL-52
APO Barlow
3-element apochromatic air-spaced, FMC.
Great color correction and contrast.
2" APO 2.5x Barlow Lens
90 Erecting Prism
High quality prism, coating and finish, for good correct-image views of celestial
objects. Perfect in daylight too.
Erecting prisms
2" 45 1.25" 45
with 2" Barrel

2" Eyepieces
Super Wide Angle (72 ).
25mm 33mm, 40mm focal
lengths, FMC.
Generous eye-relief.
1.25" Eyepieces
Super Wide Angle (72 ).
9 mm, 15 mm, 20 mm focal lengths.
5 elements in 4 groups, fully multi coated.
Parfocal.
P15
www.william-optics.com
P16
Crafting the Earth's Finest Astronmical Instruments
SWAN Eyepieces
UWAN Eyepieces
Uwan Eyepieces
Ultra Wide Angle (82 )
28mm (2"),
16mm (1.25"),
7mm (1.25"),
4mm (1.25").
Mounting Rings
These felt-lined mounting rings are made out of solid
aluminum, powder painted. A worthwhile investment if
you want the best out of your mount and telescope.
90 mm Mounting Rings internal diameter
Red Dot Finder
This very practical r.d.f. comes with a handy, quick-release bracket
included in the price. Centering your objects in the sky has never
been easier!
Red Dot Finder with Quick Release Bracket

P17
www.william-optics.com
P18
Crafting the Earth's Finest Astronmical Instruments
6x30 FinderScope
30mm Bracket
30mm Bracket
6x30 FinderScope
6x30 erecting illuminated finderscope.
The red illuminated reticle allows precise aligment.
Combo Plate
A mount is only half of the equation. Actually less than half. The best
telescope and the best mount, still need a versatile mounting plate to go
with. William Optics Combo plate (dovetail and saddle plate) is elegant,
solid, and machined to the highest standards, as any WO product.
Combo Plate
Reducer / Flattener
In addition to reducing the focal length by a factor of 0.8 for fast photography,
it works as a flattener of the field curvature for sharp and pinpoint stars in
your pictures. It is especially recommended to imagers using a CCD
camera.
0.8x Reducer/Flattener with CCD camera adapter
This very elegant 2" reducer/field flattener comes with a CCD camera
adapter.

William Optics is the manufacturer of the products sold on WOnline and through its
Authorized Dealers sales network. This means that each original item is covered by the WO
warranty. For a period of two years from the date of original retail purchase, WO will repair
or replace a defective product provided it is returned to WO freight prepaid, with proof of
purchase. Please contact WO to solve any warranty claim.
If the product has been misused, mishandled or if repairs have been attempted or performed
without explicit consent from WO, the warranty will be deemed void. Normal wear-and-tear
is not covered by this warranty. If the claim is denied because it is deemed to be a non-
manufacturing defect, the customer will be notified of the reasons of denial.
This warranty is the manufacturer's warranty; additional warranties may apply but are
beyond William Optics Corp.'s responsibility.
WO reserves the right to verify all warranty claims for defective products. WO furthermore
reserves the right to change these terms and conditions and product specifications or to
discontinue products without previous notice. This does not affect your warranty rights.
Beyond the warranty period it is the customer's responsibility to deal directly with WO in
order to agree upon any repairs or replacements. Please contact William Optics for further
details on your options to obtain service on one of our products.
William Optics Corporation (WO) neither intends to nor will ever disclose your personal
information to third parties without your consent. All company personnel with access to
customer information are aware of our policies and are trusted professionals in the field.
WO intends to enforce these provisions vigilantly for your peace of mind and protection.
Company Policies
If your purchase has incurred any damage during shipping, you didn't receive the correct
product or parts are missing, contact us or your Authorized WO Dealer within 48 h of
delivery in order for us to assist you without delay.
Carrier-caused problems must be reported to the carrier as well.
William Optics Corp.
Complete Name & Address,
Contact No. and E-mail
Purchased Product,
including Serial No. if available
Place and date of Purchase
Reasons for return
Return Authorization Number
Please read the refund policy carefully and if you have any doubt, please contact your
Authorized Dealer or William Optics Corp.
Return in perfect condition upon receiving your RA # to where instructed.
All return charges are the responsibility of the purchaser.
Privacy Policy :
Repair Policy :
Manufacturer Warranty :
Damage, Shortage & Incorrect Shipment :
If nonetheless you wish to return an item for a refund, please contact us for a return
authorization number (RA#), fill in the return form here below and return together with your
product to where instructed.
All returns to be refunded must be in perfect conditions, with original paperwork, packaging
and proof of purchase.
Refunds after 14 days from the invoice date are subject to a 15% restocking fee. No refund
will be allowed after 30 days from the invoice date.
The customer must prepay all transportation costs.
Original shipping charges, taxes or customs duties are not-refundable.
We hope that you are happy and delighted with your purchase.
Return and Refund Policy :
ZenithStar Fluorite Doublet
2005 William Optics Corp.
P19
www.william-optics.com
P20
Crafting the Earth's Finest Astronmical Instruments