BRESSER 8843100 Junior Refracting Telescope Instruction Manual

: June 5, 2024
: BRESSER

Table of Contents

Junior Refracting Telescope
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- Moon filter

Junior Refracting Telescope

Telescope 60/700
Art. No. 8843100

Operating Instructions

WARNING: Never use this device to look directly at the
sun or in the direct proximity of the sun. Doing so may result in a risk of blindness.

RISK to your child!

Never look through this device directly
at or near the sun. There is a risk of BLINDING

YOURSELF!

Children should only use this device under supervision. Keep packaging materials (plastic bags, rubber bands, etc.) away from children. There is a risk of SUFFOCATION!

Fire/Burning RISK!
Never subject the device – especially the lenses – to direct sunlight. Light ray concentration can cause fires and/or burns.

RISK of material damage!
Never take the device apart. Please consult your dealer if there are any defects. The dealer will contact our service centre and send the device in for repair if needed.

Do not subject the device to temperatures exceeding 60 C.

TIPS on cleaning
Clean the lens (objective and eyepiece) only with the cloth supplied or
some other soft lint-free cloth (e.g. micro-fibre). Do not use excessive pressure this may scratch the lens.

Dampen the cleaning cloth with a spectacle cleaning fluid and use it on very dirty lenses.
Protect the device against dirt and dust. Leave it to dry properly after use at room temperature. Then put the dust caps on and store the device in the case provided.

RESPECT privacy!
This device is meant for private use. Respect others‘ privacy – do not use the device to look into other people‘s homes, for example.

DISPOSAL
Dispose of the packaging material/s as legally required. Consult the local authority on the matter if necessary.

Your telescope consists of these parts:

Vertical fine adjustment
Focus wheel
Focus tube
Zenith mirror
Eyepiece
Finderscope holder
Finderscope
Telescope (Telescope tube)
Lens hood
Objective lens
Locking screw
Screw for the vertical fine adjustment mechanism
Yoke
Azimuth Safety
Tripod head
Accessories caddy
Tripod leg
Wing screw
Screw
Eyepiece extender
Compass
Moon filter

Assembly

First, you assemble the tripod. For this, you‘ll need the following parts:

Fix the tripod to the tripod head with the help of the wing screw, washers and wing nuts.

Attach the middle span to the tripod spans with the small screws. – Important! The golden circle on the middle span must be pointing upwards.

Finally, screw
the accessory
plate onto the
middle span.

Now, you turn to the telescope tube and find the following pieces:

telescope setting

First, you need to fix connect the finderscope to
the finderscope holder (insert and tighten with
three screws).

You will notice three threads protruding from
the telescope tube. Here, you can attach the
holder with the finderscope.

Next, screw the vertical fine adjustment to the
protruding silver metal supports on the telescope
tube.

Now it’s going to get difficult! It is best if you
let someone help you. You need to attach the
telescope tube to the tripod. To do so, take the
spiral screw with the washers and screw the
tube to the tripod head.

Attach the locking screw for the vertical fine
adjustment to the tripod head yoke.

Now, mount the zenith mirror on to the focus
tube.

If you want to use the eyepiece extender, attach
it to the zenith mirror.

Finally, select one of the three eyepieces and
fix it to the zenith mirror (or on the eyepiece
extender).

Azimuthal mounting

Azimuthal mounting just means
that you can move your telescope up and down,
left and right, without having to adjust the tripod.
With the help of the azimuth safety and the
screws for the vertical fine adjustment, you can
lock your telescope in order to fix on an object
(have this object right in your field of vision).
With the help of the vertical fine adjustment,
you can move the telescope slowly up and
down. And after you release the azimuth safety,
you can move it right and left.

Vertical fine adjustment

Azimuth Safety

Before looking through your telescope for the first time

Before you look at something for the first time,
you must coordinate the finderscope and the
telescope lens. You have to position the finderscope
in such a way that you see the same
thing through it as you do through the eyepiece
of the telescope. This is the only way you can
use your finderscope to hone in roughly on objects
before you observe these objects magnified
through the telescope eyepiece.

Coordinating the finderscope and the telescope

Look through the telescope eyepiece and hone
in on a far away object that you can see well
(for instance, a church tower). Focus in on the
object with the focus knob in the way shown in
figure 11.
Important: The object must be located in the
middle of your field of vision when you look
through the telescope eyepiece.
Tip: If you loosen the locating screws for the
vertical fine adjustment and the vertical axis,
you will be able to move the telescope to the
right and left, up and down. When you have the
object well placed in your field of vision, you
can retighten the locating screws and fix the position of the telescope.

Look through the telescope eyepiece and hone
in on a far away object that you can see well
(for instance, a church tower). Focus in on the
object with the focus knob in the way shown in
figure 11.
Important: The object must be located in the
middle of your field of vision when you look
through the telescope eyepiece.
Tip: If you loosen the locating screws for the
vertical fine adjustment and the vertical axis,
you will be able to move the telescope to the
right and left, up and down. When you have the

object well placed in your field of vision, you
can retighten the locating screws and fix the
position of the telescope.
Next, look through the finderscope. You will see
the image of the object you honed in on in the
crosshairs. The image will be upside down.
Note: The image you see through the finderscope
is upside down because the lenses are
inverting it. This is completely normal, and not
an error.

Which eyepiece is right?
First of all, it is important that you always choose an eyepiece with the highest focal width for the beginning of your observation. Afterwards, you can gradually move to eyepieces with smaller focal widths. The focal width is indicated in millimeters, and is written on each eyepiece. In general, the following is true: The larger the focal width of an eyepiece, the smaller the magnification! There is a simple formula for calculating the magnification:
Focal width of the telescope tube : Focal width of the eyepiece = magnification
You see: The magnification is also depends on the focal width of the telescope tube. This telescope contains a telescope tube with focal width of 700 mm. From this formula, we see that if you use an eyepiece with a focal width of 20 mm, you will get the following magnification: 700 mm / 20 mm = 35 x magnification

To make things simpler, I’ve put together a table with some

magnifications:

Telescope tube

focal width

|

Focal width of

eyepiece

|

Magnification

|

with 1.5x inverting lens

---|---|---|---

700 mm

|

24 mm

|

29x

|

43,5x

700 mm

|

20 mm

|

35x

|

52,5x

700 mm

|

12,5 mm

|

56x

|

84x

700 mm

|

6 mm

|

116x

|

174x

700 mm

|

4 mm

|

175x

|

262,5x

Use of the moon filter

If the image of the moon is too bright for you,
you can screw the green moon filter into the
bottom of the thread of the eyepiece. Then you
can set the eyepiece normally into the zenith
mirror.
The image that you see by looking through the
eyepiece is now greenish. The moon appears
less bright, and so observation is more pleasant.

Technical data:
• Design: achromatic refractor
• Focal width: 700 mm
• Objective lens diameter: 60 mm
• Viewfinder: 5×24
• Mounting: azimuthal with tripod
Possible objects for observation:
We have compiled and explained a number
of very interesting celestial bodies and star
clusters for you. On the accompanying images
at the end of the instruction manual, you can
see how objects will appear in good viewing
conditions through your telescope using the
eyepieces that came with it.
The Moon
The moon is the Earth’s only natural satellite.
Figure 13)
Diameter: 3.476 km
Distance: approx. 384 401 km
The moon has been known to humans since
prehistoric times. It is the second brightest
object in the sky (after the sun). Because the
moon circles the Earth once per month, the
angle between the Earth, the moon and the sun
is constantly changing; one sees this change in
the phases of the moon. The time between two
consecutive new moon phases is about 29.5
days (709 hours).

Orion Nebula (M 42)
M 42 in the Orion constellation (Figure 14)
Right ascension: 05:32.9 (Hours: Minutes)
Declination: -05:25 (Degrees: Minutes)
Distance: 1.500 light years
With a distance of about 1500 light years, the
Orion Nebula (Messier 42, abbreviation: M 42) is
the brightest diffuse nebula in the sky – visible
with the naked eye, and a rewarding object for
telescopes in all sizes, from the smallest field
glass to the largest earthbound observatories
and the Hubble Space Telescope.
When talking about Orion, we‘re actually
referring to the main part of a much larger cloud
of hydrogen gas and dust, which spreads out
with over 10 degrees over the half of the Orion
constellation. The expanse of this enormous
cloud stretches several hundred light years.
Ring Nebula in Lyra constellation (M 57)
M 57 in the Lyra constellation (Figure 15)
Right ascension: 18:51.7 (Hours: Minutes)
Declination: -+32:58 (Degrees: Minutes)
Distance: 2.000 light years
The famous Ring Nebula M 57 in the
constellation of Lyra is often viewed as the
prototype of a planetary nebula; it is one of
the magnificent features of the Northern
Hemisphere’s summer sky. Recent studies
have shown that it is probably comprised of
a ring (torus) of brightly shining material that
surrounds the central star (only visible with
larger telescopes), and not of a gas structure in
the form of a sphere or an ellipsis.
If you were to look at the Ring Nebula from
the side, it would look like the Dumbbell
Nebula (M27). With this object, we’re looking
directly at the pole of the nebula.
Dumbbell Nebula in the Vulpecula (Fox)
constellation (M 27)
M 27 in the Fox constellation (Figure 16)
Right ascension: 19:59.6 (Hours: Minutes)
Declination: -+22:43 (Angle: Minutes)
Distance: 1.250 light years
The Dumbbell Nebula (M 27) in Fox was the
first planetary nebula ever discovered. On July
12, 1764, Charles Messier discovered this new
and fascinating class of objects. We see this
object almost directly from its equatorial plane.
If you could see the Dumbbell Nebula from one
of the poles, it would probably reveal the shape
of a ring, and we would see something very
similar to what we know from the Ring Nebula
(M 57). In reasonably good weather, we can see
this object well even with small magnifications.
EC Declaration of Conformity
Bresser GmbH has issued a
“Declaration of Conformity” in
accordance with applicable
guidelines and corresponding
standards. The full text of the EU declaration
of conformity is available at the following
internet address:
www.bresser.de/download/8843100/
CE/8843100_CE.pdf
UKCA Declaration of Conformity
Bresser GmbH has issued a „Declaration
of Conformity“ in accordance
with applicable guidelines and
corresponding standards. The full text of the
UKCA declaration of conformity is available at
the following internet address:
www.bresser.de/download/8843100/
UKCA/8843100_UKCA.pdf
Bresser UK Ltd. • Suite 3G, Eden House, Enterprise
Way, Edenbridge, Kent TN8 6HF, Great Britain
Warranty & Service
The regular guarantee period is 5 years and
begins on the day of purchase. You can consult
the full guarantee terms and details of our
services at www.bresser.de/warranty_terms.