Bresser SpaceExplorer MC 127/1900 EQ User manual

Instruction manual
SpaceExplorer MC 127/1900 EQ
Maksutov-Cassegrain telescope
Art. No. 9621804

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 2
GENERAL INFO
http://www.bresser.de/download/9621804
DOWNLOADS:
• Astronomy software
• Moon map
• Instruction Manual
• Accompanying reading material "Astro Basics
WARNING!
Never use a telescope for an unprotected view of the sun! As soon as
you look directly at the sun, or even at its immediate surroundings, you
risk immediate and irreparable damage to your eye. This damage of the
eye happens mostly painlessly and therefore without any warning to the
observer, so that it is perhaps already too late as soon as eye damage has set in.
Therefore, never point the telescope or its viewfinder at or next to the sun. Never
look through the telescope or its viewfinder when it is moving. During observation,
children must remain under adult supervision at all times.

Never look into or near the sun with a telescope: Risk of blindness!
PARTS OVERVIEW
3
Fig.1c
3&
3(
3
3
Fig.1a
Fig.1b 




C
B

Ca








B
Ca
C
C


(
2
2
2
2
Explanations of the items from p. 5 ff.
onwards.
2a
2
2 3
Fig.1d
2&
3
3
2
2
&

CONTENTS / NOTES
Never look into or near the sun with a telescope: Risk of blindness!
4
About this Instruction Manual
• Read the operating instructions and the general warnings carefully before assembly and before initial commission-
ing.
• All BRESSER telescopes and accessories are under constant technical development. For this reason, we reserve
the right to make minor changes to the product specifications in order to improve the product. This also means that
illustrations may not correspond in whole or in part to the parts included in the scope of delivery. However, the gen-
eral operation is the same and the assembly as well as the use of the purchased product can still be carried out as
described.
• No part of this manual may be reproduced, transmitted, transcribed or translated into any language in any form with-
out the written permission of Bresser GmbH. Errors and omissions reserved.
• Please keep this manual handy for future reference.
Chapter��������������������������������������������������������������������������������Page
About this Instruction Manual.......................................... 4
General warnings.............................................................. 4
Introductory words about this telescope and its use..... 5
Description of the components (according to Fig. 1a-1d)
5
Assembly........................................................................... 8
Listing of parts - Unpacking.............................................. 8
Assembly instruction ......................................................... 8
Getting started ................................................................ 10
Balancing the telescope .................................................. 10
ALIGNING THE VIEWFINDER.......................................... 10
Using accessories........................................................... 12
Eyepieces......................................................................... 12
Barlow Lens ..................................................................... 12
Smartphone adaptor........................................................ 12
Observation..................................................................... 13
Observation during manual operation ............................. 13
Moon Observations ......................................................... 13
Tracking of an object ....................................................... 13
The parallactic home position ......................................... 14
Maintenance & Service................................................... 15
General maintenance instructions ................................... 15
Technical data ................................................................. 16
Warranty & Service ......................................................... 17
General warnings
DANGER OF BLINDNESS!
Never look directly at, or near to the sun with this device. There is a RISK OF BLINDNESS!
DANGER OF SUFFOCATION!
Children must only use the device under adult supervision. Keep packaging materials (plastic bags, rubber bands, etc.)
away from children! There is a DANGER OF CHOKING!
FIRE HAZARD!
Do not expose this device - especially the lenses - to direct sunlight! Focusing of sunlight could cause fires.
RISK of MATERIAL DAMAGE!
Do not disassemble the device! In the event of a defect, please contact the after sales support number listed below.
Do not expose the device to high temperatures.
Protect privacy!
The binoculars are intended only for private use. Respect the privacy of your fellow human beings - do not look into
the immediate living space of others (e.g. garden, apartment, etc.) with this device!

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 5
COMPONENTS
Introductory words about this telescope and
its use
This telescope from BRESSER is a versatile and high-resolution optical
instrument. It shows nature in even greater, detailed detail. First and fore-
most, it is designed to study the starry night sky. For example, it can be
used to view Saturn with its distinctive rings at a distance of 1.3 billion
kilometres. But also other planets or the moon, nebulae, star clusters and
even far away galaxies beyond the borders of our solar system can be
seen with this so called "stargazer". Maksutov-Cassegrain telescope.
The handling of the special mirror optics as well as the equatorial profes-
sional mount require a little training time in advance, in order to exhaust all
the possibilities of the telescope. We therefore recommend that you study
the operating instructions and the accompanying literature carefully. It's
worth it! With the included accessories, however, simple observations can
already be made once the first steps have been correctly set up and car-
ried out.
Description of the components according to Figure 1a
to 1d
1 Ocular clamp screws: Fix the eyepiece in to the plug-in sleeve (also
point 3). A sensitive tightening of the clamping screw is sufficient.
2 Eyepiece holder: Accepts the eyepiece or a star diagonal mirror (see
2a).
2a Star diagonal mirror 90° mirror system in front of the eyepiece, which
allows a more comfortable observation position. Insert the star diagonal
mirror directly into the eyepiece holder, as well as the eyepiece and now
tighten the knurled screws. (see Chap. "Structure", pt. 13).
3 Eyepiece: Insert the supplied eyepiece into the holder provided or the
star diagonal mirror (see point 2/2a) and fix it in place with the knurled
screws. The eyepiece magnifies the image captured by the telescope.
4 LED viewfinder: Projects a red dot on to a mirrored surface, which helps
to align the observation object with the image centre of the telescope
eyepiece.
5 Battery compartment of the LED viewfinder: Contains a button cell bat-
tery (CR2032) which supplies power to the LED viewfinder (red dot).
6 On/off rotary switch: Turn the rotary switch to turn the LED viewfinder
on or off.
TIP: After your observation session, turn off the LED viewfinder. This saves
the batteries!
7 Viewfinder shoe/base: Holds the LED viewfinder in place.
8 Focus knob: It causes a fine movement of the focusing drive and ena-
bles the precise focusing of an object. The telescope can be focused in
a range from about 150m to infinity. Rotate the focus knob to focus on
objects.
9 Dust cover: Prevents dust and coarse dirt from penetrating optical sur-
faces or the tube and maintains the optical quality of the instrument.
NOTE: The dust cover should be replaced after each observation.
However, first make sure that all the dew that has accumulated during
observation has completely evaporated before replacing the dust cover.
10 Optical Tube: The most important optical component. The tube con-
tains the main optics and thus collects the light from distant objects
and brings it together to form a focal point so that it can be observed
through the eyepiece.
11 OTA prism rail: To be attached to the mount (see chap. "Structure",
pt.7).
13 N/A
BFor information on selecting
the correct eyepiece, see the
chapter "Using accessories".
For information on mount-
ing the viewfinder, see the
"Assembly" section (items 9
and 9a).
For information on aligning the
viewfinder, see the chapter
"Aligning the Viewfinder" sec-
tion.
 Information on the assembly
of the tube and the associat-
ed components in the chapter
"Assembly" (from point 7)

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS!
6
COMPONENTS
14 Viewfinder prism rail: Attaches to the viewfinder shoe (see Chap.
"Structure", pt. 9).
15 Viewfinder fixing screws: Tighten the screws to fix the prism rail of the
viewfinder in the viewfinder shoe (14).
16 N/A
17 Declination/DEC Clamp: influences the manual movement of the tele-
scope. Turn the DEC clamp counterclockwise to release the telescope
clamp. You can then rotate the telescope freely around the declination
axis. By turning the DEC clamp clockwise (hand-tighten only), you pre-
vent the telescope from being moved manually.
18 Right ascension axis (RA) pitch circle: More information in the accom-
panying booklet (download via link on p. 2).
19 Declination axis pitch circle (DEC): More information in the accompany-
ing booklet (download via link on p. 2).
20 Counterweight rod receptacle: The counterweight rod is screwed into
this and then the counterweights are pushed on and clamped. Find
more information in the chapter "Assembly"
21 Counterweight with counterweight clamping screw (21a): Balances the
weight of the optical tube. Tighten the counterweight clamping screw
to prevent it from slipping off the counterweight rod.
22 Counterweight Bar Unit: Slide the counterweight onto the counter-
weight rod (see 21).
23 Counterweight locking screw: Prevents the counterweight from acci-
dentally slipping off the counterweight rod.
24 Flexible rotary shafts for the RA axis and DEC axis.
25 Clamping screw for the pole height. By loosening this screw, the pole
height of the telescope can be adjusted with the long spindle screw
27.
26 Azimuth fine adjustment screws: With these screws you can adjust the
horizontal rotation of the mount while centering the Polar star in the
eyepiece or use the adjusted finder for this purpose first.
27 Pole height adjustment screws: Used to set the latitude of the observa-
tion position. By loosening the pole height clamping screw (25), the pole
height of the telescope can now be adjusted.
28 Polar altitude scale: This allows you to read the latitude of your observ-
ing site, which you make by operating the polar altitude adjustment
screw. (seechap. "Assembly", pt. 6).
29 N/A
30 N/A
31 Pole height axis for setting the pole height of the so-called right ascen-
sion axis: More information in the accompanying booklet (download via
link on p. 2)
32 N/A
33 RA Clamp: Controls the manual movement of the telescope. By turning
the RA locking screw counterclockwise, you free the telescope and
allow it to rotate freely around the RA axis. Turn the screws clockwise
(hand tight), close the clamp again and prevent the telescope from
moving manually. However, you can now use the rotary shaft (24 below)
for the fine drive of the RA axis.
34 DEC drive shaft
35 Mounting connection screw. This connects the tripod head and the
mount base. Hand-tighten the screws to ensure that the mount is
secure.
36 Height adjustable tripod rod: Carry the telescope mount. The mount is
placed on the tripod head (see chap. "Assembly", pt. 4).
37 Spreader plate with integrated accessory holder: provides spreading of
the tripod legs under slight tension against the spreader plate ends and
increases the stability of the tripod. Eyepieces or other accessories can
be conveniently stored when not in use, but remain within reach.
38 Height adjustment screws for tripod legs: Loosen the screws to extend
the lower tripod leg segments. Once you have reached the appropriate
tripod height for you, tighten the screws again.
39 Tripod head: The mount is inserted into the tripod head and screwed
to it.
2& For more information on set-
ting the width scale, refer to the
chapter "Assembly instructions",
point 2. 6.
DEFINITION:
In this manual, the terms "Right
Ascension" (RA), "Declination"
(DEC), "Elevation" and "Azimuth"
(AZ) are mentioned several times.
These terms are explained in more
detail in the accompanying book-
let (download via link on p. 2).
& ATTENTION!
Hold the optical tube when loos-
ening the DEC clamp! The weight
of the tube could cause it to
suddenly swing! You could injure
yourself or damage the tube.

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 7
COMPONENTS
ASTRO TIPS
Surf the Internet
The Internet offers one of the most exciting resources for astronomy. There is
a wealth of websites on the Internet with new images, discoveries and the latest astronom-
ical information. For example, when Comet Hale-Bopp was approaching our Sun in 1998,
astronomers from all over the world displayed their latest photos on a daily basis. You
can find websites on the Internet for almost any topic that is somehow related to astron-
omy. Try the following search terms: NASA, Hubble, HST, Astronomy, Messier, Satellites,
Nebulae, Black Hole, Variable Stars, etc.If you are interested in the latest product related
and technical information from Bresser, check out their website. There you will find links
to other astronomical websites. You can find our website at the following address: http://
www.bresser.de
Here are some links to third party provider sites. No liability can be assumed for
the content
of these pages:
• Internet forum "Astronomie.de": astronomy.com/
• The magazine "Astronomie - DAS MAGAZIN": www.astronomie-magazin.com
• The journal Astronomy: www.astronomy.com
• Internet forum "Astrotreff www.astrotreff.de
• Astronomical clubs and planetariums: https://www.sternklar.de/gad/
• Astronomy "The Picture of the Day antwrp.gsfc.nasa.gov/apod/
• Publication Stargazing Associations: www.sternzeit-online.de
• Interstellarum magazine: www.interstellarum.com/
• Sky & Telescope magazine: www.skyandtelescope.org
• The magazine "Stars and Space": https://www.spektrum.de/lp/suw_magazin
• "Heaven's Above:
Information for satellite observation: www.heavens-above.com/
• Hubble Space Telescopes
Image Releases: www.spacetelescope.org
• European Southern Observatory www.eso.org
This list is only a small selection and does not claim to be complete. The address details
were current at the time of going to press and are the responsibility of the providers.
Listed names are in alphabetical order.

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS!
8
Assembly
Listing of parts - Unpacking
It does not take long to prepare the telescope for the first observation.
When you open the package for the first time, please check the following
individually packaged parts:
Telescope:
• Equatorial mount
• Height-adjustable field tripod with clamping and fixing screws
• Optics tube with dust cap, eyepiece holder and prism rail
• 2 eyepieces (Plössl 25/10 mm)
• Star diagonal mirror
• Counterweight and counterweight rod.
• LED viewfinder with viewfinder mount
Instructions for assembling the telescope
The packages contain the tube and its individual parts, the tripod with the
mount and the accessories.
1. Remove the individual parts from the packaging and also familiarise
yourself with them at the same time. Use also the pictures 1a to 1c
(page 2-3) to find your way when assembling your telescope. When
you take the tripod out of the packaging, keep it parallel to the ground,
otherwise the inner legs of the tripod will slip out as they are not yet
screwed down.
2. Assembly - Tripod: The tripod legs are pre-assembled and already con-
nected to the tripod head and the tripod spider (A, Fig 2). Remove the
tripod from its packaging and place it vertically with the tripod feet fac-
ing down. Now take two of the tripod legs and carefully pull these tripod
legs apart to the fully open position. The entire weight of the tripod rests
on one leg. Then set up the tripod so that it stands straight. Now pull
out each tripod leg individually to the desired length (Fig. 3) and tighten
one clamping screw each (a total of 3 pcs.) by hand. Do not overtighten
the screws! The clamping screws are used to lock the inner tripod leg
segments at the desired height.
3. Assembly - Installing the accessory tray: The accessory tray (B, Fig. 2) is
placed in the centre of the tripod spider with the flat side facing down-
wards and installed by turning it clockwise through 60°. The three lugs
of the accessory tray must align with the retaining brackets of the tripod
spider and lock into place.
4. Assembly - Attaching the mount: Place the mount on the tripod head
(Fig. 5). Insert the central screw from below into the tripod head and
screw it to the mount (Fig. 6).
5. Assembly - Attaching the counterweight to the counterweight rod (Fig. 7):
Screw the base of the counterweight rod (22, Fig. 1d) onto the existing
external thread all the way to the end. Now screw the counterweight rod
into the internal thread of the counterweight holder (Fig. 1d, 20) until it
stops. Then turn the base of the counterweight rod back against the stop
of the declination axis and thus counteract the counterweight rod. Then
counter the rod with the base. If you look through the large hole in the
counterweight, you will see the bolt that blocks the hole. When you move
the counterweight slightly, the bolt disappears in its hole and releases the
hole. If it does not, carefully unscrew the clamping screw on the counter-
weight until the bolt moves. Remove the locking screw (23, Fig. 1d) from
the rod. Then, while holding the counterweight firmly, push it to about the
middle of the counterweight rod (22, Fig. 1d). Tighten the counterweight
locking screw securely and reinstall the locking screw.
NOTE:
Should the counterweight ever start to slip, the locking screw prevents
it from slipping completely off the rod. Always leave the locking screw in
place as long as there is a counterweight on the rod.
ASSEMBLY
Fig. 2: The tripod with accessory
tray
Fig. 3. Tripod leg clamp
Fig. 4. Tripod head
Fig. 5. Mounting the mount on the
tripod
A
B
Fig. 6: Central screw

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 9
ASSEMBLY
6. Set latitude: It is easier to adjust the latitude before you attach the
weights and place the tube on the mount. Locate the latitude scale (28, Fig.
1d). Note that there is a triangular pointer above the scale on the mount.
The pointer is not fixed. It moves as soon as the mount moves. Determine
the latitude of your observation location. You can find information on this
in our accompanying booklet ( download via link on p. 2 ) or take a look at
the atlas. Loosen the pole height clamping screw (Fig. 1d, 25) and turn the
polar altitude adjustment screw (Fig. 1d, 27) until the pointer shows the lat-
itude you want. The adjustment screws work by an adjustment and counter
mechanism (i.e. before you tighten one, loosen the other). Once the pointer
shows the width you want, tighten both screws until they make contact with
the mount.
7. Attaching the optics tube to the mount (bracket): Unscrew the locking
screw (B, Fig. 8) on the prism holder until you can comfortably insert the
prism rail (11, Fig. 1a) of the optical tube into the dovetail base of the rail
(A, Fig. 8a). Then retighten the locking screw (B, Fig. 8) firmly.
8. Positioning of the tube: Hold the optical tube firmly. If not done directly
during insertion, now move the tube (10, Fig. 1a) within the prism hold-
er until its position corresponds to the holder on the title page. Then
retighten the locking screw (B, Fig. 8). For more information, see the
chapter " Balancing the Telescope".
9. Attaching the LED viewfinder: Mount the viewfinder shoe (A, Fig. 9) on
the optical tube (B, Fig. 9). Loosen the clamping screws (C, Fig. 9) on
the LED viewfinder and slide the viewfinder onto the holder. Carefully
retighten the clamping screws so that the viewfinder is mounted on the
holder without slipping.
The LED viewfinder must be aligned with the telescope after installation
and before first use. Please read the chapter "Aligning the LED view-
finder".
10. Battery in LED viewfinder (Fig. 10): The pre-installed battery in the LED
viewfinder is protected against discharge by a plastic plate. Remove the
plastic plate before the first use.
To change the battery, first push the battery compartment out of the side.
Remove the empty battery and insert a new one into the compartment.
IMPORTANT:
Only use a button cell of the type CR2032. When inserting, note the correct
position of the battery poles (+/-).
11. Attaching the eyepiece holder (Fig. 11): Remove the dust protection
cap from the opening of the beam path at the end of the tube (A, Fig.
11). Place the eyepiece holder (B, Fig. 11) on the thread at the end of
the tube and screw the union nut over it by hand. Then insert the star
diagonal mirror (Fig. 11, C) into the eyepiece holder in the desired ori-
entation and clamp it with the knurled screw on the side.
NOTE:
Sometimes the eyepiece holder is already pre-mounted on the beam path.
12. Inserting the eyepiece (Fig. 11) for the straight view mode: Remove
the dust cap from the eyepiece holder. Place the dust cap in a safe
place and restore it when you have finished observing to prevent dirt
from entering the telescope. Loosen the knurled screw and insert
the included eyepiece (D, Fig. 11) into the eyepiece holder. Then
hand-tighten the screw again to fix the eyepiece in place.
13. Insert the star diagonal mirror (Fig 11): 11): Recommended for a more
comfortable neck-friendly view at zenith height. It is inserted into the
eyepiece holder (B, Fig. 11) instead of the eyepiece (D, Fig. 11). Then
the eyepiece is inserted into the receptacle of the star diagonal mir-
ror. After inserting the star diagonal mirror and eyepiece, retighten the
corresponding fixing screws well so that all parts are securely fixed in
position.
14. Adjusting the tripod height: Adjust the tripod by loosening the screws
(Fig. 12) on the tripod legs. Then pull the inner tripod legs to the
desired length. Then tighten the screws again. Adjust the tripod to a
height that makes observing as comfortable as possible.
Fig. 8a: Inserting the optical tube
with the prism rail into the prism
holder and fixing it in place.
Fig. 8: Unscrewing the locking screw
on the prism holder.
Fig. 7: Attachment of the counter-
weight to the counterweight rod.
Prism
holder
A
B
Fig. 10: Battery change for the LED
viewfinder
Fig. 9: Mounting the viewfinder
bracket and attaching the LED
viewfinder.
defer
A
B
C

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS!
10
Getting Started
Balancing the telescope
To ensure that the telescope is secure and stable on the tripod and moves
smoothly and evenly, it must be balanced. To balance the telescope, open
the RA clamp (33, Fig. 1d). When the axis is free, the telescope rotates
around the RA axis. Later on, you will also have to open the DEC clamp
(17, Fig. 1d). When is opened, the telescope will also rotate around the
DEC axis. The movement of the telescope occurs around these two axes,
individually or simultaneously. Try to familiarize yourself with these clamps
and observe how the telescope is moving around each axis. To find the
best possible balance for your telescope, follow the method described
below:
1. Hold the tube tightly so that it does not swing around freely by accident.
Loosen the RA clamp (33, Fig. 1d). The tube now moves freely around
the RA axis. Now let the telescope rotate until the counterweight rod is
parallel to the ground.
2. Open the counterweight clamping screw and slide the counterweight
(21, Fig. 1d) back and forth on the counterweight rod until the tele-
scope is in a position in which it does not move in either direction when
released and is thus in balance. Then tighten the counterweight screw
again so that the counterweight remains in its current position and can-
not slip.
3. Then hold the tube again so that it cannot move freely. Then close the
RA clamp (33, Fig. 1d) and open the DEC clamp (17, Fig. 1d) again. The
telescope is now able to move freely around the DEC axis.
Loosen the clamping screws of the tube clamps (13, Fig. 1a), so that
the main tube can easily slide back and forth in the tube clamps. Now
move the tube back and forth in the tube clamps until it stays in one
position without moving in any particular direction. Then close the DEC
clamp (17, Fig. 1d) and retighten the clamping screws tube clamps. The
telescope is now properly balanced in both axes. The next step is to
align the finder scope.
ASSEMBLY
Fig. 12: Adjusting the height of
the tripod legs and tightening the
clamping screws.
Clamping screws
Fig. 11: Installation sequence for
optical accessories on the focusing
unit.
CBA
D

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 11
GETTING STARTED
Aligning the viewfinder
The LED viewfinder must be adjusted before use. This means that the
"viewing direction" of the LED viewfinder and the optical tube must be
matched:
1. Remove the dust caps from your telescope.
2. If you have not already done so, attach the eyepiece holder (2, Fig. 1b) to
the screw thread of the tube end. Then insert the star diagonal mirror (2a,
Fig. 1b) and the eyepiece (3, Fig. 1b) into the eyepiece holder. Please read
paragraphs 11 to 13 in the chapter "Assembly".
3. Now look through the LED viewfinder and find an object that is at least
1000m away. Ideally, the red dot of the LED viewfinder should already
be visible as centrally as possible above the observed object when aim-
ing at it.
4. Loosen the RA clamp (33, Fig. 1d) and the DEC clamp (17, Fig. 1d), so
that the telescope moves freely in both axes. Now point the main tele-
scope at a large, clearly visible fixed land object (e.g. a church spire, a
high-voltage pylon or another prominent fixed point) located at a dis-
tance of at least 1000m and bring it to the centre of the eyepiece of the
main telescope. Focus the image by turning the focusing knob (8, Fig.
1b). Then tighten the RA and DEC clamps again.
5. Now look "straight" through the LED viewfinder and check whether the
targeted object can also be seen here in the centre. If so, then the view-
finder is already adjusted!
However, if this is not the case, carefully turn the viewfinder adjustment
screws one after the other (A+B, Fig. 13) until the red dot is exactly in
line with the targeted object (e.g. the top of a tree).
Check this occasionally with a comparative look through the eyepiece of
the telescope.
Now you are ready to make your first observation.
ATTENTION! DANGER!
NEVER look at or near the sun! Observing the sun will inevitably lead to
immediate and irreparable eye damage - even if it lasts only the tiniest
fraction of a second. In addition, your telescope itself will also be dam-
aged.
Alternatively, you can also adjust the viewfinder using a celestial object
(Fig. 14) such as a bright star or the moon.
Proceed as described in steps 3 and 4.
Now that the viewfinder is adjusted, any object that is centred there will
also be centred in the eyepiece of the telescope. Congratulations !With this
alignment, objects that were first seen in the wide field of view of the finder
scope will also be seen in the eyepiece of the main telescope.
Fig. 13: Positioning the observation
object in the LED viewfinder using
the adjustment screws (horizontal:
A, vertical: B).
On/Off rotary switch (C)
Fig. 14: Aligning the LED viewfinder
to a celestial object (here the centre
of the moon).
B
A
C
44
88

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS!
12
Use accessories
Eyepieces
The main function of a telescope eyepiece is to magnify the image pro-
duced by the main optics of the telescope. Each eyepiece has a specific
focal length, which is specified in millimetres (mm). The smaller the focal
length, the greater the magnification. Thus, an eyepiece with a focal length
of 10mm produces a higher magnification than an eyepiece with 25mm.
Long focal length eyepieces provide a wide field of view, bright high con-
trast images and reduce eye fatigue during long periods of observation.
If you are looking for an object with a telescope, you should always start
with a lower magnification eyepiece (e.g. 25mm). Then, when the object is
found and is in the center of your eyepiece, you can use a higher magnifi-
cation eyepiece and enlarge the image as much as the prevailing weather
conditions will allow.
The magnification of a telescope is determined by the focal length of the
telescope itself and the focal length of the eyepiece used. To calculate the
power of the eyepiece, divide the focal length of the telescope by the focal
length of the eyepiece. Here is an example using a 25 mm eyepiece. (see
"Technical data" on page 16).
Telescope’s focal length / eyepiece’s focal length = magnification of the
eyepiece
Telescope’s focal length = 1900 mm
Eyepiece’s focal length = 25 mm
Telescope’s focal length 1900 mm
Magnification = = 76
Eyepiece’s focal length 25 mm
The magnification is therefore 76x.
3x Barlow lens
The 3x Barlow lens increases the telescope’s focal length and thus also the
magnification by a factor of 3.
Installation: The Barlow lens (B, Fig. 16) is inserted directly into the eye-
piece holder (C, Fig. 16) and secured with the knurled screw (X, Fig. 16).
The required eyepiece is then inserted into the Barlow (A, Fig. 16) and
secured with the knurled screw (Y, Fig. 16).
Smartphone adaptor
With this adaptor, a smartphone can be mounted to the telescope to cap-
ture bright, flat objects (e.g. the moon) or - depending on the sensor sensi-
tivity of the smartphone - also planets.
For mounting, insert the eyepiece (A, Fig. 17) through the mounting ring (B,
Fig. 17) of the Smartphone adaptor and secure it with the knurled screw (X,
Fig. 17). Insert the eyepiece with the attached smartphone adaptor into the
eyepiece socket (C, Fig 17) and clamp it there as well.
Clamp the smartphone between the two holding jaws (Y, Fig. 17) of the
smartphone adaptor so that the camera lens is positioned directly and
centrally above the eyepiece lens.
GETTING STARTED
Fig. 15a: The planet Jupiter. An
example of correct (left) and too
much magnification (right)
Visibility conditions vary greatly
from night to night and depend
largely on the observation site.
Air turbulence also occurs during
apparently clear nights and dis-
torts the image of objects. If an
object appears blurry and poorly
defined, go back to an eyepiece
with a lower magnification. This
will give you a sharper, better
defined image (Fig. 15a).
B
C
YX
A
Fig. 17: Attaching the smartphone
adaptor to the eyepiece socket.
B
C
Y
X
A
Fig. 16: Attaching the Barlow lens
to the eyepiece socket.

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 13
OBSERVATION
Observation
Observation with manual operation
After the telescope is assembled and balanced as described, you are
ready for manual observation. Pick an easy-to-observe object on Earth
such as a street sign or traffic light and familiarize yourself with the tele-
scope's functions. To achieve the best possible result, please observe the
following instructions:
• To locate an object, first loosen the RA clamp (33, Fig. 1d) and the DEC
clamp (17, Fig.1d). The telescope can now move freely around its axes.
First loosen the clamps individually and familiarise yourself with the
individual movements. Then loosen both clamps at the same time. It is
important that you familiarise yourself with all the movements of your tel-
escope, as handling a parallactic mount can take some getting used to,
especially at night in complete darkness.
• Now use the finder scope to locate the object of your choice. When you
have the desired object in your sights, close the RA and DEC clamps
again.
• The eyepiece of a telescope magnifies the image captured by the tele-
scope's primary mirror. Each eyepiece has a focal length, expressed in
millimeters (mm). The smaller the focal length, the higher the magnifica-
tion. For example: an eyepiece with a focal length of 9mm has a higher
magnification than an eyepiece with a focal length of 26mm.
Eyepieces with a lower magnification offer a larger field of view, provide
brighter and higher contrast images and are more comfortable for the
eye during longer observations. At the beginning of an observation, you
should always start with a weaker eyepiece, such as the supplied Plössl
25 mm. When the desired object is centred and focused, you can switch
to a larger eyepiece to magnify the object as much as the observing con-
ditions will allow.
• Once centered, an object can be brought into focus using the focusing
knobs on the focusing unit (8 Fig. 1b). However, keep in mind that the
desired object will slowly move out of field of view due to the rotation of
the earth on its own axis. This impression is even reinforced at high mag-
nification.
Moon Observations
Point the telescope (picture: (Keep in mind, however, that the moon is not
visible every night) Now practice using the different eyepieces to observe
different details on the moon. There are many different details to look at on
the moon, such as craters, mountain ranges, and grooves. The best time
to observe the moon is during its crescent or sickle phase. At this time,
the sunlight hits the moon at a very shallow angle, giving its appearance
a vivid depth. At full moon there are no shadows to be seen at all, which
makes the surface of the moon look very bright, flat and uninteresting.
Therefore, when viewing the moon, you may want to consider using a
neutral density moon filter. Among other things, this not only dampens the
glaring light of the moon, but also increases the contrast at the same time.
Tracking of an object
While the earth turns under the night sky, the stars seem to wander from
east to west. The speed with which the stars perform this movement is
called "sidereal velocity".
WARNING!
Never use a tele-scope for an
unprotected view of the sun! As
soon as you look directly at the
sun, or even at its immediate
surroundings, you risk immediate
and irreparable damage to your
eye. This damage to the eye usu-
ally occurs painlessly and there-
fore without any warning to the
observer that perhaps everything
is already too late and that eye
damage has occurred. Therefore,
never point the telescope or its
viewfinder at or near the sun.
Never look through the tele-
scope or its viewfinder when it is
moving. During an observation,
children must remain under adult
supervision at all times.
IMPORTANT NOTE:
Objects viewed through the view-
finder appear upside down and
upside down.
Objects observed through the
eyepiece of the main tube, which
sits on the telescope via a zenith
prism, appear upright but also
laterally inverted.
This effect does not interfere with
the observation of astronomical
objects. Incidentally, these effects
occur with all astronomical tele-
scopes.

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS!
14 14
OBSERVATION
The parallactic home position
1. Balance the mount; if necessary, adjust the height of the tripod legs.
2. Loosen the RA clamp (33, Figure 1d). Swivel the tube until the counter-
weight rod points directly to the ground (see also Fig. 18a and 18b).
3. If you have not already done so, align the entire telescope assembly, so
that the tripod leg under the counterweight rod faces (approximately)
to the north. Then open the DEC clamp (33, Fig. 1d), so that the optical
tube (10, Fig. 1a) can be swivelled. Now turn the tube until it points to
the north and ideally to the North Star (Polaris). Then close the clamps
again. More information on finding the North Star in the accompanying
booklet (download via link on p. 2).
4. If you have not already done so, determine the latitude of your obser-
vation location. Use the adjustment screws for the latitude (27, Fig. 1d)
to adjust the telescope mount, so that the pointer points exactly to the
correct latitude of your observing site on the latitude scale (28, Fig. 1d).
More information on latitude determination in the additional literature
(download via link on page 2).
5. If steps 1 through 4 have been performed reasonably accurately, your
telescope is now sufficiently well aligned with Polaris, the North Star,
and you can begin making observations.
Once the mount has been aligned with the polar star as described above,
it is not necessary to adjust the latitude setting again, unless you move
your observation to a completely different geographical location (different
latitude setting required).
IMPORTANT NOTE:
For almost all astronomical observing requirements, approximate estimates
of latitude are quite acceptable. So don't let excessive attention to the
exact position of the polar star take away the joy of your telescope.
Fig. 18a: The parallactic home
position, side view
Mounting
horizontally
bring
Align the tripod leg under
the counterweight rod,
facing North.
Align the tube
to the north
Align the coun-
terweight rod
so that it points
towards the
floor
North
Fig. 18b: The parallactic home
position seen from the North.
ASTRO TIPS
Further studies / accompanying reading
This instruction manual provides only the most important information
on using the telescope. In order to make full use of the manifold possibilities of
the instrument, you should definitely delve deeper into the subject of "astronomy".
For this purpose, we have compiled some helpful information in an accompanying
booklet, which you can download free of charge via the following weblink:
http://www.bresser.de/download/astrowissen
Furthermore, we have listed below topics that are also worth taking a closer look
at. Below you will find a list of books, magazines and organizations that may be
of use to you.
Topics
1. How to measure the distance of a star? What exactly is a light year?
2. How were the craters of the moon formed? How old are the earth, moon and sun?
3. What are stars made of? Why do the stars have different colours?
4. What is a "nova", a "supernova"?
5. What is meant by comets, asteroids, meteors and meteor showers?
6. Was ist ein „Planetarischer Nebel“? What is a "globular cluster"?
7. What does the term "big bang" mean? What is behind the "universe"?
Books
1. Adventure Astronomy by David H. Levy
2. The Cambridge Star Atlas by Wil Tirion
3. Cosmos Celestial Year by Hans-Ulrich Keller
4. Telescope guide in 4 steps, Oculum Verlag
Magazines
1. Astronomy - THE MAGAZINE
2. Stars and space
Organizations
1. Association of Stargazers e.V. / Germany (VdS)
2. astronomie.de , astrotreff.de
This list is only a selection and does not claim to be complete.

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS! 15
MAINTENANCE AND SERVICE
General maintenance instructions
This telescope is considered a precision optical instrument that will give
you many years of enjoyment. As long as you give your telescope the care
and attention due a precision instrument, you will very rarely need factory
service or other appropriate maintenance.
IMPORTANT NOTE:
Always strictly adhere to the instructions given here in case of possible
maintenance. Since this is a sensitive opto-mechanical instrument, even
the smallest steps performed incorrectly can cause irreparable damage to
the device! The manufacturer accepts no liability for damage resulting from
improper handling or maintenance!
The following points should be noted:
A Avoid cleaning the telescope optics too frequently. A little dust on the
front of your telescope's lens, or on the mirror surface, causes virtually
no reduction in imaging quality, and so a little dust should not cause you
to constantly clean the optical surfaces.
b. Only if absolutely necessary, the jam on optical surfaces can be
removed with gentle movements of a fine photo brush. You can also
blow the dust away with a small bellows. However, do not use any pho-
tographic lens cleaners under any circumstances!
c. Organic soiling (fingerprints, etc.) on optical surfaces is best removed
with a cleaning fluid consisting of three parts distilled water and one
part isopropyl alcohol. You may add a small drop of biodegradable dish-
washing liquid per half litre of cleaning liquid. Also, use only soft, white
cosmetic wipes, make short, careful wiping motions, and change wipes
as often as possible.
Attention:
Do not use fragrance impregnated, dyed or lotion soaked cloths as
they will damage your optics.
D Never, for any reason, remove the optics from their mount; not even to
clean them or for any other reason. You would probably not be able to
reinsert them at the exact position and risk a serious degradation of the
optical performance of your telescope. In such cases, Bresser accepts
no liability whatsoever for any damage incurred.
e If your telescope is used outside during a humid night, dew may settle
on the surface of the telescope. Normally, such wetness does not cause
any damage, but it is strongly recommended to dry the telescope with a
suitable cloth each time before storing it. However, never wipe the optical
surfaces dry! Instead, leave the telescope in a warm room for a while so
that the damp optical surfaces can dry by themselves. Wait until the tele-
scope is completely dry before repacking it.
f. Never leave your telescope in a locked car on hot summer days.
Excessive temperatures can affect the internal lubrication.

Never look at or near the sun with the telescope: THERE IS A RISK OF BLINDNESS!
16 16
TECHNICAL DATA
SpaceExplorer MC 127/1900 EQ
Item number 9621804
Optical design Maksutov-Cassegrain
Free aperture 5" = 127 mm
Focal length 1900 mm
Aperture ratio / photographic aperture f/14,9
Maximum resolution 1 arcsecond
Mount equatorial/parallactic
RA and DEC drive/movement manual, via flexible shafts
Max. useful magnification 250x
Tripod height adjustable field tripod
Technical data

WARRANTY & SERVICE
17
Warranty
The regular guarantee period is 2 years and begins on the day of purchase. To benefit from an extended voluntary guar-
antee period as stated on the gift box, registration on our website is required. You can consult the full guarantee terms
as well as information on extending the guarantee period and details of our services at www.bresser.de/warranty_terms.
DE AT CH BE
Bei Fragen zum Produkt und eventuellen
Reklamationen nehmen Sie bitte zunächst mit
dem Service-Center Kontakt auf, vorzugsweise
per E-Mail.
E-Mail: [email protected]
Telefon*: [phone]
BRESSER GmbH
Kundenservice
Gutenbergstr. 2
46414 Rhede
Deutschland
*Lokale Rufnummer in Deutschland (Die Höhe der Gebühren je
Telefonat ist abhängig vom Tarif Ihres Telefonanbieters); Anrufe aus
dem Ausland sind mit höheren Kosten verbunden.
GB IE
Please contact the service centre fi rst for any
questions regarding the product or claims,
preferably by e-mail.
E-Mail: [email protected]
Telephone*: [phone]
BRESSER UK Ltd.
Suite 3G, Eden House
Enterprise Way
Edenbridge, Kent TN8 6HF
Great Britain
*Number charged at local rates in the UK (the amount you will
be charged per phone call will depend on the tariff of your phone
provider); calls from abroad will involve higher costs.
FR BE
Si vous avez des questions concernant ce produit
ou en cas de réclamations, veuillez prendre
contact avec notre centre de services (de
préférence via e-mail).
E-Mail: [email protected]
Téléphone*: 00 800 6343 7000
BRESSER France SARL
Pôle d’Activités de Nicopolis
314 Avenue des Chênes Verts
83170 Brignoles
France
*Prix d'un appel local depuis la France ou Belgique
NL BE
Als u met betrekking tot het product vragen
of eventuele klachten heeft kunt u contact
opnemen met het service centrum (bij voorkeur
per e-mail).
E-Mail: [email protected]
Telefoon*: [phone]
BRESSER Benelux
Smirnoffstraat 8
7903 AX Hoogeveen
The Netherlands
*Het telefoonnummer wordt in het Nederland tegen lokaal tarief
in rekening gebracht. Het bedrag dat u per gesprek in rekening
gebracht zal worden, is afhankelijk van het tarief van uw telefoon
provider; gesprekken vanuit het buitenland zullen hogere kosten met
zich meebrengen.
ES PT
Si desea formular alguna pregunta sobre el
producto o alguna eventual reclamación, le
rogamos que se ponga en contacto con el centro
de servicio técnico (de preferencia por e-mail).
E-Mail: [email protected]
Teléfono*: [phone]
BRESSER Iberia SLU
c/Valdemorillo,1 Nave B
P.I. Ventorro del Cano
28925 Alcorcón Madrid
España
*Número local de España (el importe de cada llamada telefónica
dependen de las tarifas de los distribuidores); Las llamadas des del
extranjero están ligadas a costes suplementarios..
Service

NOTES

NOTES

Bresser GmbH
Gutenbergstraße 2
46414 Rhede · Germany
www.bresser.de
@BresserEurope
© 2021 Bresser GmbH, 46414 Rhede, Germany.
No part of this manual may be reproduced, transmitted, transcribed or translated into any lan-
guage in any form without the written permission of Bresser GmbH.
Errors and technical changes reserved.
Manual_9621804_SpaceExplorer-MC-127-1900-EQ_de_BRESSER_v012023a