NPZ TAL-65 User manual

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TAL-65 REFLECTING
TELESCOPE
INSTRUCTION MANUAL

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NPZ Optics State Corp.
(Novosibirsk Instrument-making plant)
D. Kovalchuk 179/2 Novosibirsk,
630049 RUSSIAN FEDERATION
Fax [phone]
[email protected];
www.npzoptics.com

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General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Technical specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Inventory list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Construction of the telescope . . . . . . . . . . . . . . . . . . . . . . . . . 6
Preparing telescope for observations . . . . . . . . . . . . . . . . . . . 8
Balancing the polar axis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Balancing the declination axis . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Observations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Collimation (alignment) of the optics . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Acceptance certicate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Dew to continuous product improvements, specications are
subject to change without notice.
09.03
TABLE OF CONTENTS

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GENERAL INSTRUCTIONS
Warning!
Never observe the Sun through your telescope or its nder
scope without a black lter - permanent eye damage could
result.
Do not let children use telescope at daylight without an adult
control.
The telescope TAL-65 (hereinafter referred to as the telescope)
is designed for visual observations of celestial objects.
The telescope can be used for individual observations by ama-
teur astronomers, in the schools, in the astronomic societies.
The telescope may be used at an ambient temperature ranging
from 30° to -30°C and the relative humidity not more than 80%,
on the assumption of fair weather.
Read instruction manual rst before using the telescope.

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TECHNICAL SPECIFICATIONS
Aperture 65 mm
Focal length 500 mm
Telescope magnication and angular eld
With eyepiece f’ = 15mm 30х 1°15'
With eyepiece and Barlow lens 90х 0°25'
With eyepiece, Barlow lens and plug 130х0°15'
Resolving power 2.2''
Limiting visual magnitude 11m
Right ascension turning angle 360° (24h)
Declination turning angle ±90°
Latitude adjustment range 0…90°
Minimum observation range ~ 25 m
Dimensions, mm
OTA* length 470
Telescope height 620
Telescope weight 3.6 kg
*Optical Tube Assembly
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INVENTORY LIST
1 Telescope 1
2 Counterweight 1
3 Eyepiece 1
4 Barlow Lens 1
5 Plug 1
6 Black lter 1
7 Box 1
8 Instruction manual 1
Component
pos. Quantity

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The telescope consists of optical
tube assembly (OTA) (1), German
equatorial mount (2), a tripod (3).
The optical tube is a basic
component of the telescope. It
includes all main optical units such
as a primary mirror, a diagonal
mirror and a focuser.
A Newtonian Reflecting Teles-
cope: parallel beams of rays
enter the tube of the telescope
and is projected at the focal plane
of the eyepiece (3) with the help
of primary (1) and diagonal (2)
mirrors.
It is necessary to use black lter
(4), having established it on the
eyepiece, while observing the solar
events.
The primary mirror is spherical, the
diagonal mirror is at. Both mirrors
are covered with high reflection
aluminum coatings with protective
level. For ash reduction the internal
tube surface is blackened.
The eyepiece has Ramsden
scheme.
The telescope gives inverted
image.
CONSTRUCTION OF THE TELESCOPE
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The minimum 30x magnication is
obtained when the eyepiece is set
into a focuser.
Having established rst the Barlow
lens and than the eyepiece, the 90x
magnication is obtained.
Having established the plug
into the Barlow lens, then the
eyepiece, the maximum 130x
magnification is obtained. The
more the magnification of the
telescope, the less the angular eld
of view. This is why the observation
is recommended to begin with the
minimum magnication, gradually
increasing it.
The equatorial mount is designed
for pointing the telescope at the
interesting objects.
The mount with the optical tube are
secured on the height regulated
tripod.
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BALANCING THE POLAR AXIS
Take a telescope out of the package.
Release the clamp knob (1); lay
the OTA in the rings at about the
midpoint of the tube’s length with
and x it with the knob.
Release the handle on the latitude
bracket (2), turn the tripod into the
work position and x it.
Establish the telescope on the at
hard surface.
Screw the axis with the counter-
weight (3).
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Place the polar axis in the hori-
zontal position (0° on the latitude
dial).
Release the handle, that fixes
the polar axis. Slide the counter-
weights along the counterweight
shaft until they counterbalance the
OTA. Fix the polar axis.
PREPARING TELESCOPE FOR
OBSERVATIONS
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To provide a smooth motion of the telescope and reliable operation of
equatorial mount drives, the balancing of the telescopes is required.

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Place the Dec. axis in the horizon-
tal position.
Release the handle, that xes the
Dec. axis.
Slide the OTA forward or back in
the tube rings until balanced.
Fix the Dec. axis.
Set the polar axis of the equatorial
mount.
Using latitude adjustment knob (3),
move R.A. axis up or down in order
to set the latitude of your location.
Due to Earth’s rotation, celestial
objects move in the telescope
eld of view (the higher telescope
magnication – the faster those
movements appear). More
precisely polar alignment is done,
less correction is needed.
For visual observations point the
R.A. (polar) axis of the telescope
towards Polaris (αUMi). See the
picture. The tripod should be xed
in this position while observation is
hold. This way the polar axis will be
oriented to the celestial pole.
Use nder system if quick pointing
to the celestial object is required.
BALANCING THE DECLINATION AXIS
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Polaris
Polar
axis
Ursa Major
Axis of
declinations

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The equatorial mount is designed
for pointing the telescope at the
celestial objects and tracking their
movement.
The equatorial mount consists of
the polar axis (5) and the axis of
declination (3).
All operations of pointing OTA at
different celestial objects should be
made with help of clamps (2), (6)
and slow-motion controls (1), (7).
Set the eyepiece into the focuser (2).
To change magnification use
Barlow lens and plug (see “Const-
ruction of the telescope”).
Slow-motion controls (1) are used
for best clarity.
When the sun is observed, set the
black lter (4) on the eyepiece (3).
Minimum magnications are used
when the wide field of view is
needed. For example, when star
accumulations, nebulas, comets or
the Moon are observed.
OBSERVATIONS
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Maximum magnications help observing some details on the
Luna and planets, some double stars and the elements of star
accumulations.
Telescope’s mirror is very sensitive to abrupt temperature changes,
this is why let the mirror acclimatize rst while observing outside
in winter season.
Avoid observations through a window if the inside and outside
temperatures differ more than 2-3°C. Otherwise temperature
differences cause images to look blurred and distorted, so that
observations are meaningless.
It is necessary to preserve telescope from vibrations and knock for
high-quality observations.
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This simple operation can be
performed by everyone. Remove
the Barlow lens and the eyepiece
out of the focuser drawtube and
check the reflection of primary
mirror in the secondary one. The
reection of the secondary mirror
together with the pier should be
centered in the primary mirror.
The alignment is needed when
reection is off-centered.
While carefully rotating one of
the three alignment screws (1),
check the direction of the reection
displacement. Choose the screw
and direction to center reection.
All screws are glued with the glue.
Use a spirit to turn off the screw.
COLLIMATION (ALIGNMENT) OF THE
OPTICS
* Collimation (alignment) of the optics is permitted only in case of absolute
necessity, and after expiration of manufacturer limited warranty.
As any other the primary mirror of a telescope needs collimation
(alignment) from time to time*.
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Improper cleaning of the aluminized mirrors can scratch their
coatings, so one should use blower bulb or special brush to remove
dust from the surfaces.
Spots of grease and smudges may be washed away. To clean the
primary mirror, carefully remove the mirror cell from the telescope
by loosening screws, which hold it inside the OTA. Do not remove
mirror from the mirror cell. Carefully wet the mirror surface with a lot
of pure spirit (alcohol) using the cotton cloth. Using the same cloth
without pressure clean the mirror surface and then rinse the mirror
under a stream of water. Wait till the water trickles away. Swab
remaining water drops from the surface with a dry cloth edge.
To clean the secondary mirror use the same procedure.
Use only quality optical lens cleaning tissue and optical lens
cleaning uid specically designed for multi-coated optics to clean
your eyepieces and nderscope.
Lens or mirror surfaces should be cleaned as infrequently as
possible, only when absolutely necessary.
Keep the dust cover on the front of the telescope and the end cap
on the focuser tube when not in use.
MAINTENANCE
In order to keep telescope in good operating condition one should
provide good care and maintenance for the instrument.
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STORAGE
The telescope must be kept in a clean, dry (humidity must not
exceed 80%), dust-free place with an ambient temperature between
+5° and +40°C.
Avoid collision and shaking of the telescope.
It is prohibited to store acids, alkalis, and any chemically active
substances, which may produce evolved gas or vapor harmful for
the optics, at the same place with the telescope.
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Telescope TAL-65, serial # __________________
Passed the product approval and found serviceable.
Manufacturing date __________________
Signatures _________________________
NPZ Optics State Corp.
(Novosibirsk Instrument-making plant)
D.Kovalchuk 179/2 Novosibirsk,
630049 RUSSIAN FEDERATION
Tel.[phone]
Fax [phone]
[email protected]
www.npzoptics.com
ACCEPTANCE CERTIFICATE