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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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

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Use a miniature reex camera with an
objective’s thread M42×0,75 to take
pictures of celestial objects.
To mount a camera on the telescope,
take off deflecting mirror (1) and
bushing (2), unscrew the camera
objective lens.
Screw a reducing bushing 2” in the
camera.
Insert the camera (1) with a reducing
bushing into the eyepiece tube (2)
and secure them by the screw (3).
High-quality guiding can be
performed with the help of off-
axis guide or telescope-guide (not
included into the delivery set).
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Photographic
observations
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In order to keep the telescope in good operating condition it is necessary
to check it’s technical state and full maintenance.
Keep the telescope clean and protect it against physical damage to
provide no-failure operation of the telescope.
Periodically wipe off the dust from metal surfaces with clean soft
napkins, then wipe them by the napkin wet with acid-free Vaseline
and dry with napkin.
Wipe the objective’s and eyepiece’s lenses with dry linen napkin. To
remove oil spots use a cotton wad wet with alcohol.
Conduct the cleaning of the diagonal mirror surface without pressure
by cotton wad wet with ether, having removed a dust by a soft lens
brush rst to avoid thin scratches.
In idle position the telescope tube and the eyepiece tube should be
permanently closed with lids.
Cleaning of the telescope optical components requires caution and
accuracy. Perform it only in case of emergency.
Optics self-cleaning and disassembling of the telescope are
permitted ONLY after expiration the warranty period.
Maintenance
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The necessity in additional alignment of the telescope can appear after
optics cleaning or accidental misalignment.
The telescope alignment should be held by specialists, as it requires
special skills and qualication.
Telescope alignment

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It is necessary to store the telescope in a dry heated place with
a temperature range of +5° to +40 °C and relative humidity up to
80%.
Avoid impacts and sharp shocks of telescope.
It is prohibited to store acids, alkalis or any chemical materials,
emitting moisture or active chemical gases and vapor.
Storage
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Acceptance certicate
Telescope TAL-125-5АРО, serial No. ______________,
is t for operation.
Date of issue ______________ 20 ___
Signatures _________________
Manufacturer:
Federal State Unitary Enterprise
Production Amalgamation
“Novosibirsk Instrument-Making Plant”
Dusi Kovalchuk, 179/2,
Novosibirsk, 630049,
Russia