William Optics GRAN TURISMO 71 APO User manual

GRAN TURISMO 71 APO
Owner’s Manual ver. 1.0
2017.06

Contents
What is in the Box 3
Specication 4
Telescope Diagram 5
Accessories Map 6
Usage 7
Storage and Cleaning 8
Caution and Safety, Optional Equipment 9
Optional Equipment 9
Recommended Accessories 10

Gran Turismo 7 1 User Manual
What is in the Box
Soft Carry Case
Case Shoulder Strap
1.25”-2” Adapter
GT71 APO Telescope
Aluminium Knob Protection Cap
2 Mounting Rings
Dovetail Plate
2 Years Warranty Card

Gran Turismo 71 User Manual
Aperture 71mm
Focal Ratio F/5.9
Focal Length 420mm
Resolving
Power 1.62”
Limiting
Magnitude 11.1
Image Circle GT71 Φ40mm / GT71 with Flat 6 Φ42mm
Objective Type 3 elements Air-spaced with FPL53 glass
Lens Shade Retractable
R&P Focuser 2.5” 360° Rotating Camera-angle Adjuster, 1:10 ne
focus
1.25” Adapter
Field Stops Bafes
Typeofmount IncludesmountingringsandVixenstyledovetail
Tube Diameter Main tube 82mm/Dewshieldtube92mm
Tube Length (325 mm) Fully Retracted
(427 mm) Fully Extended
Tube Weight 2.2kg
Specication

Gran Turismo 7 1 User Manual
Telescope Diagram
[2] [3] [4] [6] [11]
[1]
[8]
[10]
[7]
[11]
[12]
[13]
[14] [15]
[4]
[1] Dust Cover
[2] Retractable Dew Shield
[3] Main Tube
[4] Mounting Rings
[5] Dovetail Plate
[6] R&P Focuser
[7] 10:1 Ratio Fine Knob
[8] Fine Knob Protection Cover
[9] Temperature Gauge
[10]Three lock screws
[11]1.25” inch Adapter
[12]1.25” inch plastic cap
[13]Draw Tube Tension Adjustment
[14]Vixen Style Bracket Holder Screws
[15]WO Finder Bracket Holder Screw
[5] [9]

Gran Turismo 71 User Manual
Accessories Map
GRAN TURISMO 71 APO
EQ Mount
1.25” Eyepiece

Gran Turismo 7 1 User Manual
The Gran Turismo 71 is designed for both daytime and nighttime viewing, as an out- standing travel scope. We recommend purchasing a WO 2” star diagonal to make the
most of these little telescopes.
Since the Gran Turismo 71 is well suited to viewing nebulae, clusters, large galaxies, and
comets, we recommend the use of high-quality wide-angle eyepieces. The WO SWAN,
XWA, and SPL series eyepieces are available in a variety of focal lengths. Viewing the
moon and planets is also impressive at magnications of 140X when the seeing condi-
tions permit.
To calculate the magnication 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 magnication) and then zoom in by switching
to higher powered eyepieces. The largest eld of view will be seen using a 12x low pow-
er-wide eld 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 astronom-
ical 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 Gran Turismo Telescopes are suitable for large-eld astrophotography; Gran Turis-
mo 71 has a great color correction at a fast speed of f5.9.
Please see our website for examples of photos taken with this telescope. The Accesso-
ries Chart on page 5 and page 10 provides additional details on photographic accesso-
ries for various CCD, digital and lm cameras.
Never aim your telescope or nder scope at the Sun without proper Solar lters
installed on the front of the telescope. Doing so for even a moment may perma-
nently damage your vision. Proper Solar lters consist of lters made by reputa-
ble manufacturers, designed to t tightly over the front of the dew shield Solar
eyepiece lters are not considered safe, and should not be used. With proper
front mounted Solar lters, the telescope will not be harmed by viewing the Sun.
Contact your Authorized WO Dealer for further information on the brands, sizes, and pric-
esofpropersolarlters.
Usage

Gran Turismo 71 User Manual
Storage and Cleaning
• We suggest placing all accessories inside an airtight container with desicca-
tive control. Secondly, remember to store the telescope in a non-humid envi-
ronment, never leave it le build up. Be particularly careful after a night obser-
vation that the lens has no dew on it before storing the telescope away.
• In case the lens surface becomes dusty, smeared, or gets ngerprints or fun-
gus build-up on it, rst of all, remove any surface particle by using an air blowe
build-up on it, rst 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 indi-
cations are not necessary if you carefully protect your telescope.
• The beautiful nish of your Gran Turismo 71 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.
A. All WO telescopes are now tted with a smooth and precise dual speed 1:10 focusing sys-
tem, it means that for every ten full rotations of the small ne-focus knob the large knob rotates
once.
B.The focuser drawtube tension can be adjusted using a 3 mm Allen key and tension should be
adjusted only when necessary by progressively tightening the screw until you reach the desired
2mm Screw
Draw Tube Locking Screw
B. 3mm Screw
A. 10:1 Ratio Knob
Heavy Duty
R&P Focuser

Gran Turismo 7 1 User Manual
Caution and Safety, Optional Equipment
Optional Equipment
• Caution! Never directly view the sunlight with your telescope.
• Do not aim your Gran Turismo 71 at the Sun because this might impair your Loss of
eyesight can occur when your telescope is not properly protected by solar viewing
lter. (Solar lters can be easily purchased through your WO Authorized Dealers).
• Always place the optical telescope assembly (OTA) on a completely at surface, unsta-
ble placement of telescope may cause it to fall, and if handled without caution, it may
easily injure you and others.
• Never use your telescope under rainy conditions: this telescope is not designed to be
waterproof. If your telescope accidentally gets caught in rain, please wipe down the
water with a dry clean cloth, but if the lens gets totally soaked by water, please contact
your WO Authorized Dealer right away for details on a service solution.
• Do not disassemble or attempt repairing your telescope without a written authori-
zation from William Optics Corp.: this violates the warranty terms under the limited
product warranty section and invalids any guarantee. Always consult with your local
WC Authorized Dealer or with William Optics Corp. for details on how to service your
telescope.
In order to operate your Gran Turismo 71 you will need the following mini-
mum equipment:
• A sturdy tripod for astronomical birding usage or a mount (equatorial or ALTAZ).
• A mirror diagonal or erecting prism (The WO 2” Dielectric Durabright Diagonal
is strongly recommended for better results in star observation and digital pho-
tography.
• A top-quality 2” Durabright Diagonal is also available now.
• At least one or two good eyepieces (5 to 40 mm wide-eld recommended) de-
pending on the application.
• Other accessories depending on the application.
• Finder Bracket, Finder Scope and Field Flattner (Flat 6 for GT71).

Gran Turismo 71 User Manual
Recommended Accessories
2” Rotolock Durabright
Diaelectric Diagonal
Finder Scope
EQ Mount
Flattner 6 for GT71
Finder Scope Mounting
Bracket
XWA (100 °-110 °) Eye
Pieces