NPZ TAL-125-5APO User manual

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TELESCOPE
TAL-125-5АРО
SERVICE MANUAL

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Contents
Page
General instructions 3
Specications 4
Delivery set 5
Design of telescope 7
Preparation for observations 8
Assembling of telescope 8
Adjustment of optical axes 8
Observations 10
Visual observations 10
Photographic observations 11
Maintenance 12
Telescope alignment 13
Storage 14
Acceptance certicate 15
Due to continuous development and improvement of
telescopes, there can be insignicant changes in their designs,
which are not reected in this publication.

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General instructions
Warning!
To avoid eyes injury, do not look at the Sun through an eyepiece
or a nder of the telescope!
Children can look through the telescope under the adult’s control
only.
The telescope is designed for visual observation and photographing
of celestial objects. It requires careful treatment and denite
knowledge of astronomy. Only in this case, operation with the
telescope will satisfy its owner.
The telescope can operate in an open air environment within a
temperature range of +30 °C to -30 °C.
When buying a telescope, pay you attention to the integrity of
packaging, which is provided with manufacturer’s seals. After
opening the packaging, check the complete set, indicated in the
list of enclosure.
Read the instructions carefully before mounting and using your
telescope.
With suggestions, please contact:
FSUE PA “Novosibirsk Instrument-Making Plant”,
630049, Novosibirsk, Dusi Kovalchuk street, 179/2,
Marketing Department, tel/fax: [phone],
[phone],
e-mail: [email protected]; www.npzoptics.ru.
Moscow Ofce, tel/fax [phone],
e-mail: [e-mail].
Saints-Petersburg Ofce,
tel/fax [phone].
Krasnoyarsk Ofce,
tel/fax: [phone], 27-53-20,
e-mail: [email protected].
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Specications
Name
Objective lens diameter, mm 125
Focal length, mm 940
Aperture ratio 1:7,5
Resolution limit 1"
Limiting stellar magnitude 12,0m
Finder:
visual magnication, x 6
objective lens diameter, mm 30
Focusing device 1,25"; 2"
Tube length, mm 1150
Telescope weight, kg 8,0

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Delivery set
Name
Telescope +
Finder 6х×30 +
Service manual +
Supplementary accessories
Parallactic mount
МТ-3S-2D with a counterweight of 3,7 kg –
Pole nder 6х×23 –
Hand controller –
Power supply unit –
Metal tripod –
Cable (10 m) –
Pier C75R (1000 mm) –
Barlow Lens 2х–
Eyepieces (1,25"):
f' = 6,3 mm –
f' = 7,5 mm –
f' = 12,5 mm –
f' = 17 mm –
f' = 20 mm –
f' = 25 mm –
f' = 32 mm –
f' = 40 mm –
Wide-angle eyepieces (1,25"):
f' = 10 mm –
f' = 15 mm –
f' = 20 mm –

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Name
Super wide-angle eyepieces:
f' = 15 mm (1,25") –
f' = 20 mm (2") –
f' = 24 mm (2") –
f' = 25 mm (2") –
Prism for direct observation
PP-45° (1,25") –
Eyepiece-guide 12,5 mm (1,25") –
Light lters М28,5×0,6:
black –
neutral –
yellow –
blue –
red –
green –
Light lters М48×0,75:
black –
neutral –
yellow –
blue –
red –
green –
Car Cable (10 m) –

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Optical tube is a telescope itself.
All the main optical assemblies are
mounted into it: objective lens with
corrector, eyepiece assembly with
focusing mechanism and optical
nder.
According to the type of optical
scheme the telescope refers to the
apochromatic refractors. There is
used an original optical scheme, not
containing special sorts of glass, in
the telescope. Parallel beam of light
gets into the telescope tube and with
the help of objective lens (1) and
corrector (2) is projected at the focal
plane of an eyepiece (4).
For observation convenience, the
eyepiece assembly is inclined
relatively to the telescope axis by
90º with the help of at diagonal
mirror (3).
There is a nder integrated in the
optical tube, and facilitating the
search of objects in the sky.
All surfaces of lenses are coated with
multi-layer clearing coverings.
The eyepiece assembly includes
focusing mechanism with eyepiece
tube.
Focusing mechanism of frictional
type includes an axis with
handwheels (1), with help of which
the eyepiece tube shifts.
Motion smoothness of the eyepiece
tube is regulated with the help of a
screw (2).
Screw (3) provides xation of the
eyepiece tube in adjusted position.
Design of telescope
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8
Preparation for observations
Assembling of
telescope
Mount the bracket of nder (1) onto
the telescope tube and x it with
the screws (2). Fix the nder with
a screw (3).
For the period of observation take off
the cover from the blend of telescope
tube and from the eyepiece tube.
Telescope has high magnications and
consequently – small elds of view.
This complicates the search of objects
in the sky, that is why the telescope is
equipped with an optical nder with a
wide eld of view. With the help of the
nder you can easily nd the necessary
object in the sky and then observe it in
the eld of view of the telescope.
For this purpose you should adjust
the parallelism of the optical axes of
telescope tube and optical nder.
Direct the telescope at a distant
object, inserting an eyepiece into
the eyepiece tube (eyepiece is not
included into the set).
Set the image of chosen object in
the centre of the eld of view. Fix this
position of the telescope.
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Adjustment of
optical axes

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Set the image of chosen object in
the crosshairs of nder’s reticle by
turning it in spherical joint of the
bracket (1), and x this position with
the help of the screw (2). In future,
it will be enough just to check the
coalignment of the optical axes of
the telescope and of the nder, prior
to observations.
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Observations
At high magnifications, along with
increase of the visual sizes of the
object, the atmosphere become more
signicant, that appears as distortion
and blurring of images of the distant
objects, blinking and blurring of the
stellar images.
There can be the nights with poor
images of celestial bodies because
of the atmospheric turbulence. It is
possible that at this time you will not
be able to observe the details of the
planets and the Moon under such
conditions.
Observations with the telescope
through the window are meaningless
as an uneven surface of window glass
distorts images.
Cover the telescope when work is
finished and to protect it against
precipitations.
Choose the sky object interest you.
Point the telescope tube in the direction
of the object. Find an image of the
object in the nder's eld of view and
set the object in the centre of the eld
of view.
Insert the eyepiece (not included
into the set) into the eyepiece tube.
With the help of handwheels of
eyepiece assembly, achieve the best
sharpness of the image.
Using various eyepieces, you can
get different magnications.
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Visual
observations